We Need To Torque About Bolts

(from left to right) US 1/4″, large-head 6mm, regular (hollow) 6mm, and a crank bolt for comparison…

Read: A Rough Guide To Making Your Bolts Last Years Rather Than Months.  Excuse the appalling pun I chose for the main title… it makes more sense if you say it in an Estuary English accent.

Rusty, rounded-out allen heads, dirty, greasy, snapped bolts and stripped threads; when most people think of working on their bike in any form they tend to cognitively leap to these nightmare scenarios before thinking twice about the whole affair and kicking their tool box back into the dark, spider-infested abyss.  Being the ragtag bunch we are, a lot of riders don’t really think about bolts much further than a. getting a new component and b. tightly bolting it as quickly as possible to your bike so you can get out and ride but hold up there, slugger, your bolts are the only things holding the lumps of metal you call a bike together.  Furthermore they’re the only thing stopping you landing on your teeth.  Bolts deserve our uninhibited love and respect.  So how can you bolt parts onto your bike in a fashion that prevents the bolts from turning terracotta in 6 months time and binding with the strength of a thousand pickle jars?

The answers to all bolt related problems are simple enough, I’ll try and keep it snappy as I’m very aware of the fact I’m trying to make an article about fucking bolts interesting.

So before we start, what tools are you using? And how are you using them?  Rusty tools are something you should avoid like the plague, because rust spreads like such.  Rust will transfer from your tools to any exposed metal on your bolts so always keep your tool clean, dry and rust-free.  A bit of WD-40 and some wire wool is good for getting rid of superficial amounts of rust if it does build up however.  Next up, it’s always good practice to have a good amount of leverage in your tools for the job at hand.  Sure, trying to undo your rusty-ass cranks with a tiny 3 inch long allen wrench by stamping on it might indeed work… but it could easily enough put you in hospital.  A shorter allen key will almost certainly be a cheaper allen key with sharper edges- stick with something either a little longer or use something with a proper handle ie. a multitool.  Lastly, is that allen key seated properly before you turn it?  You sure?  Wiggle it a little, push it down and repeat until you’re absolutely certain.  Rounded bolt heads are literally the worst.  While we’re on the subject of rounding things off, are you still doing up your wheels with a spanner head when there’s a socket or ring spanner to hand?  Stop dat.  A spanner head only has 2 points of contact where a ring spanner or socket have 6, spreading the load more efficiently.  Your wheel nuts will last much longer.

A US Imperial 1/4″ stem bolt (left) and a ‘large-head’ 6mm stem bolt (shown right) look very similar side-by-side but use two different sized allen wrenches and two different thread pitches. They do not fit the same stem.

90% of bike mechanics is cleaning shit no one thought to clean; and this is no different.  Let’s focus on the stem for now as it’s the component with highest concentration of bolts and it’s the easiest to fuck up.  First step is to take a 6mm allen key (or a 1/4″ if your stem is American- there is a difference) and unbolt your bars.  If you’re installing new bars then it’s never a bad idea to use some glass/sand paper to sand any paint off the knurling if it hasn’t been masked off during powdercoating.  If it’s an old stem, it’s probably absolutely filthy under the stem plate, body, and bar clamping area so grab a whole load of loo roll/ paper towels and clean all that stuff away.  Do the same with the steerer tube/clamping area.  Spray some WD-40 or some degreaser to help clean stubborn dirt away if need be.  Just like your Mum told you when using the toilet for the first time, ‘Keep wiping until there’s nothing left on the paper.’  Repeat this process with the bolts and threads until everything is dry and clean.  You can just use a parts washer if you’re a flash cunt.  It’s very important to clean any dirt away, any debris left in between two parts acts as a lubricant allowing your bars and/or steerer to slip.

Now everything is dirt free you can inspect the parts for wear and damage.  If your stem plate and body have significant scratches gorged into the clamp area from slipping, this could prematurely damage any new bars you put on them and may have reduced clamping power due to having uneven clamping surfaces.  By all means, use damaged parts at your own risk if you have no other option but if they continue to slip, I highly recommend replacing.  The same goes for your bars, if they’ve been slipping about to the point the knurling on the clamp area has been ground smooth, it might just be time for some new ones.  It’s always worth checking the holes in your stem face plate for burrs caused by over-tightening (more on that later)  These burrs will make putting the bolts through them and installing your bars an extra hassle as the bolt threads will ‘catch’ on the faceplate.  This can be remedied slightly by filing them with a round file.  Prolonged over-tightening of those bolts will warp the faceplate creating further burrs and warping until it eventually fails and takes your face with it…

Lets say everything is gravy with your bars and stem, before you go and bolt them back on, pop a little of that thin ‘3-in-1’ type oil onto your bolt threads to keep them from oxidising over long periods of time and making it a pain to undo them again.  Grease of varying kinds works well too but takes longer to clean when it becomes dirty.

This paragraph will seem to many like I’m stating the obvious, but you don’t know until you know… and plenty don’t.  Most stems will have four stem plate bolts and they’ll have one of a few ways of fastening them.  The most common and traditional way is to tighten the four bolts incrementally and evenly in an ‘X’ pattern, another is occasionally used on top load stems and involves tightening two shorter front bolts fully against the stem so the plate and body are touching before tightening the two rear bolts to tighten everything in place.  Sometimes the plate will be on a hinge, sometimes in two pieces, this changes stem-to-stem so it’s always best to check with the shop from where you bought it or the manufacturer website if completely unsure.

Over-tightening is something we’ve all been guilty of at one point or another, particularly when it comes to stems, and yet is probably the easiest way to kill a part.  I understand the reasoning behind it, it’s the logical thing to do in most people’s heads; if your stem’s slipping wrench the shit out of the bolts with a long ass allen key to clamp it tighter! The only thing you’ll find is it puts totally unnecessary amounts of stress on your parts (sometimes to the point the pinch bolts at the back cause the two sides of the stem to touch, or the bars and steerer get crushed out of shape) and still your stem will slip about like a greased up pig in a Vaseline factory.

Example of a large torque wrench- 12-60Nm

 

In MTB and road cycling, manufacturers often print torque settings onto their parts so you know exactly how tight to do up each bolt.  Contrasted against BMX, most people couldn’t tell you what a torque wrench even was…  mainly because they cost a small fortune and are far from essential.  Even I don’t own one of my own.  A torque wrench is essentially a standard ratchet wrench with a built in mechanism that clicks when you reach a desired tightness in a nut or bolt to indicate when to stop.  Getting your hands on a torque wrench and working with one for a while can teach you to gauge what kind force to put into bolts just by feeling them.  In this section I’ll approximate and describe to the best of my ability what each kind of bolt requires in the way of force, as well as the rest of the bolts on your bike as a comparison.

  • Wheel bolt/nut- 55 N m+ (Pretty much as hard as you can tighten it without shitting/ hurting yourself, you don’t want a saggy chain every time you do an ice pick do you?)
  • Crank bolt- 40-50 N m (Pretty damn tight, not putting your entire weight into it, but most of it- stopping when you feel a lot of resistance)
  • Pedal spindle- 30-35 N m (You don’t want to be using a ton of force- stop when you begin to feel increasing resistance in the pedal spanner)
  • Pivotal seat- 25-30 N m (Pretty much the same as above- just with an allen key, so there’s less leverage involved)
  • 1/4″ and large-head 6mm stem bolts– 20-27 N m (Tighten until you feel the threads slow you down, then tighten by an extra 1/8th of a turn or so.  You should feel like you’d be able push the bolt round a fair bit more if you put some elbow grease into it… don’t though.)
  • Standard 6mm stem bolt– 15- 19 N m (Simply tighten until you start feeling resistance, then stop.  It’s best to stick to the lower end of the Nm scale if your bolts are also hollow)
  • Seat clamp- 7-15 N m (lightly tighten until you feel the bolt becoming a little harder to turn but not fully resisting- you can test by trying to turn the seatpost)
  • Brake hardware- 3-6 N m (brake hardware uses smaller bolts and needs less in the way of torque, just enough to stop the bolt moving when the calipers are pivoting)

The overwhelming voice in some people’s heads will scream, ‘It’s not tight enough! Tighten it more! Tighter is safer!’ but it’s hardly ever the case.  Your first port-of-call should always be to clean the affected component before you try torquing your bolts any tighter than you already have.  Bike mechanics often work under the cautionary mantra of ‘try the least dramatic fix first’ even if that fix is simply to break out some clean toilet roll and give everything a good ol’ scrub.

 

Profile Racing Hub Guards Explained

What’s cracking peg thugs?  The folks at Profile Racing have always been great with explaining what will fit what when it comes to their components and now their hub guards are no different.  Head over to Profile’s Tech Tip 6 article for a full run down of which hub guards fit which hubs, how they fit, their qualities in relation to the hub they’re installed to and even some team rider accounts of what they ride and why.  Talk about thorough…

Top 5 Grips

Don’t fucking kid yourself, old timer, Big Cheese grips were the absolute pits.

Here’s a nice easy one, everyone likes grips, everybody rides with grips, if you don’t you’re some kind of self-hating, hand abusing masochist.  Hell, even I moved away from riding road bike tape! For the first 10 months of winter in Britain, grips are simply the way we prevent our fingers being amputated due to frostbite.  For the rest of the year they stop our sweaty, slimey, kebab and cider lathered hands from slipping a bar and landing on to our fragile arses with a familiar thud.  On a serious note, grips are the only part of your bike that ever touches your bare skin (well, you hope anyway…) so it is beneficial to have a set that suit you personally.

This time around we’ve got a panel comprised of pegless guy (with a tear in his eye) Greg Pearson and Brighton BMX Co owner Ben Stringer as well as my salty self discussing the industry’s current top 5 bar buffers. Continue reading

The Quintessential BMX Wheelbuilding Guide

I’ve laced up a fair few wheels in my time and always felt tutorial videos always fell a little short in the way that there’s just so much more to our wheels than meets the eye.  So without making too much of a song and dance I’m going to pass on to you, O’ faithful The Merged reader, pretty much everything rattling around my cranial cavity on the subject of building BMX wheels.  Stick the kettle on…

Yep… (pic nicked from Google)

Safety First.

Building wheels is potentially extremely dangerous and life threatening if done without caution.  The amount of tension stored within a single spoke can often exceed 150 kgf- effectively turning every spoke in your wheel into a makeshift crossbow bolt.  If one of those spokes gives way suddenly at the j-bend and there’s nothing to stop it, it will fire out of the rim and through anything in it’s path.  A fired spoke can very easily impale your hand so it can and will do the same to your brain if a spoke fires toward your eyes.  When working on your wheels, you must always have a decent rim strip on at the bare minimum, a tyre left on the rim isn’t a bad thing either.  If you have neither of these or can’t use them because you need to use a nipple driver, wear eye protection (your granddad’s angle grinder googles will do) and never look directly into the rim cavity while tightening spokes.  Now that I’ve scared the living shit out of you, let’s build! Continue reading

Top 5 Pegs

mutant_bmx_peg_guard

Being a sad pegless guy for the last 10 years hasn’t done much for my knowledge of grinding apparatus, and I know I’ll be hounded to the ends of the earth, not to mention strung up by my cock and balls by a rabble of peg-thugs for not doing a grind-related top 5; so I sorted it.  Don’t go saying I don’t treat you right.  For a change, this weeks panel consists of Ben Stringer, H.M.F.I.C. at BTN(Brighton) BMX Shop and Jonathan Rubbersmith, aliased industry insider with far too much to say for his own good… both seasoned grinders with a better idea about pegs than the pedal-grinding prick typing this. Continue reading

Top 5 Pedals

2012-08-07_11-49-53_262

Looks like you lot liked the whole fanzine-style ‘top 5 tyres’ thing I did last week so once again I teamed up with old school racer Chris Coutts and sad pegless guy Greg Pearson to briefly discuss our favourite pedal options available out there today.  As much as I try to keep things as balanced as possible there aren’t any aluminium pedals on the list, simply because cheap alloy pedals are rarer now and if you still ride them you probably know what you like already.  This isn’t a nostalgia-fest ‘top 5 pedals EVER’ kinda thing, it’s more of an ‘independent buyer’s guide’ so don’t go losing your shit over OG Cielinski’s not making the list like you did last week.  Pipe down and just thank your lucky stars you’re not bolting on Crupi beartraps… Continue reading

Top 5 Tyres According To The Merged

I think it’s safe to say that your tyres are ultimately the parts that determine what terrain you’ll ride most, whether you ride park, street, trails, bowls, track or flat, your tyres will probably reflect that.  Then people have their own individual tastes, whether they prefer more tread, smoother profiles, tightly packed or more agressive patterns varies from user to user.  That said, I, with a little help from Chris Coutts and Greg Pearson, have compiled a small list of our current (subject to change) tyre favourites.  Shout out to Tal Mazar for the idea.  In no particular order….

 

Tioga Comp 3

hellonwheels_bmxshop_tioga_comp3tan

CC: As an all-time hero, in my eyes there’s the Comp III…

This early 80’s legend can still be found on the bikes of trail riders everywhere, it’s hard not to have a soft spot for the classics, right?  I mean, you wouldn’t jump off a roof with them but they still roll in the woods okay…

CC: I never understood why Tioga never updated it, imagine the hype from the woodland folks!

20 x 1.75″
Inflated Width: 1.79″ (45.5mm)
Inflated Diameter: 19.5″ (495mm)
Max Pressure: 40 psi
Weight: 16.4 oz
20 x 2.125″
Inflated Width: 2.03″ (52mm)
Inflated Diameter: 20.02″ (508.5mm)
Max Pressure 40 psi
Weight: 19.7 oz

Shadow Conspiracy Contender Welterweight

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GP: I use Contenders because they’re slick shaped so slide well in parks but grip well on rough wallrides etc, many others to consider but yeah… Rubens for example are amazing grip and balance but are too thin, wear fast and are expensive…

‘A bit odd’ is what I thought at my first look at the Contender tyre with it’s recessed tread pattern but I can concure with Greg, these tyres feel great.  They look and feel more like traditional tyres than your average ‘basketball’ street tyre.

20 x 2.20″
Inflated Width: 2.16″ (55mm)
Inflated Diameter: 20.5″ (520.7mm)
Max Pressure: 110 psi
Weight: 23.6 oz
20 x 2.35″
Inflated Width: 2.30″ (58.5mm)
Inflated Diameter: 20.79″ (528mm)
Max Pressure: 110 psi

Primo V-monster

primo-v-monster-24-tyre

Tal mentioned the V-Monster when he messaged me with the idea of doing a tyre article, Chris included it within his own personal top three and I always liked it so it gets a spot.  Being the product in 1995 that made Primo into what it is today there’s certainly some history behind it and now in it’s 2.4″ version, it looks as inviting as ever.

20 x 2.40″
Inflated Width: 2.48″ (63mm)
Inflated Diameter: 21.1″ (536mm)
Max Pressure: 100 psi
Weight: 25.5 oz

Animal x T1

animal-bikes-terrible-one-bmx-tire-new-1

You gotta hand it to Terrible One, they know exactly what they like and it shines forth in this baby.  I’m not going to say that this tyre is my particular bag but anyone can appreciate the details; the dual compound, the centre tread groove, the unusually ‘edged’ profile, all pointing toward the kind of imitation-surfing and pool/tranny style that has been popping forth recently.  With the flavour-of-the-month (street; at the moment anyway…) taking up the most in the way of designing parts, it’s good to see something break the mold.

20 x 2.20″
Inflated Width: 2.24″ (57mm)
Inflated Diameter: 20.62″ (524mm)
Max Pressure: 110 psi
Weight: 28.2 oz
20 x 2.40″
Inflated Width: 2.44″ (62mm)
Inflated Diameter: 20.98″ (533mm)
Max Pressure: 110 psi
Weight: 30.6 oz

Cult x Vans.

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Chris Coutts: Cult x Vans seemed to be well priced and well loved…

Greg Pearson: I’ve never tried Cult x Vans tires, you would know more about those…

My personal (current) go-to tyre; 2.35″ front and rear. The tightly packed tread keeps it feeling slick enough for lipslides but there’s still plenty of traction for long, drawn-out wallrides.  The clincher is the large rounded profile that makes for super stable, predictable manuals, especially while in a carving arc.

20 x 2.20″
Inflated Width: 2.42″ (61.5mm)
Inflated Diameter: 20.82″ (528.8mm)
Max Pressure: 110 psi
Weight: 20.2 oz
20 x 2.35″
Inflated Width: 2.48″ (63mm)
Inflated Diameter: 20.86″ (530mm)
Max Pressure: 110 psi
Weight: 24.6 oz

(All tyre measurements from Dans Comp‘s website)

BMX And Unplanned Obsolescence

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One thing that has always fascinated me about BMX or more specifically; the economy of BMX- is the current lack and decreasing amount of what is commonly known in ‘the real world’ as planned obsolescence.  Planned obsolescence, for anyone unfamiliar with the term, is the reason you buy a new phone every year, a new games console every 2 years, a new TV every 3 years, a new fridge every 4 years, etc; instead of every 10 years- for ALL of them.  It’s not that companies can’t produce a games console that wouldn’t overheat and melt the solder, or a phone that doesn’t bend in your pocket or smash when you drop it, it’s that it doesn’t make them anywhere near as much money if they make a product that lasts a decade rather than last two years- even if they charged double for it.  800 quid per person every ten years? Or 400 quid every two years? (equating to 2000 per person every decade) It’s a very easy business decision.  The downside is that we are polluting the very planet we are stuck on with our broken junk, merely in the quest for profit.  Thanks to everyone who participates in making BMX what it is, we truely have something we can be proud of; our own little world where planned obsolescence is kept to a bare minimum. Continue reading

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