Is 1mm too tight a clearance between the chain stay and the crank arm?

mine is pretty close but i had no problems so far and I've probably cycled around 500miles on it so far so good.

Ben, the link in your OP tells you all you need to know. The left hand cup on the original TA BB is 1.5mm wider than the right. If you use a symmetrical BB then you need 19mm of protruding axle on both sides.

Now I'm really confused... Surely that would mean 106mm BB? 68+19+19?
Here is an image of the clearance, bear in mind that it is an 3 arm TA crank so might flex a bit. OH an weight wise, 107.6kg dressed and improving a bit, down to 103.1kg in the noddy.

Now I'm really confused... Surely that would mean 106mm BB? 68+19+19?
Here is an image of the clearance, bear in mind that it is an 3 arm TA crank so might flex a bit. OH an weight wise, 107.6kg dressed and improving a bit, down to 103.1kg in the noddy.

Shorter cranks will do the trick.

A bit of duct tape on the chain stay, and replace it when it's worn through.

It will strike the chain stays occasionally, and it will wear off the paint there. But it's a bike, signs of usage are beautiful things.

Now I'm really confused... Surely that would mean 106mm BB? 68+19+19?
Here is an image of the clearance, bear in mind that it is an 3 arm TA crank so might flex a bit. OH an weight wise, 107.6kg dressed and improving a bit, down to 103.1kg in the noddy.

Ben your calculation here doesn't allow for the thickness of the BB cups. On the TA BB these are (from memory) 4.5mm left and 3mm right.

http://www.sheldonbrown.com/harris/images/ta-bb-axles.gif

So the original measurements would be 17 + 4.5 + 68 + 3 + 19 = 111.5mm
I'd go for a campag 109mm. (68 - P - 120)

Cranks are already 165 and gorgeous so no way am I buying another set. Fruitbat, can I get away with the miche 110mm at £16 or do I really need the £35 campag? VB, I've indulged myself on the spec of this bike so if and when it gets scratced well and good thats use, but no way am I gaffaing the chain stay at the start.

Ah, didn't see your reply, why the campag instead of the miche? Both are the correct taper no?

Miche should work fine, I know from experience that campag works.
Didn't know that Miche did a 110

Many thanks to all of you for the advice, might manage to change out the BB in time for easties on Wednesday.

Fruitbat, just texted you re: work.

But it's a bike, signs of usage are beautiful things.

I'd rep you for that but the muppet that runs this forum seems to not want me to ;)

Be careful with your chain tension - you wouldn't want to hook the chain over the pedals at speed.

Have a look at this:

Nuts on the stem?

rear triangle bent to fuck?

anyway, probably less of a risk if you're changing the bb after all - hadn't been following the last few posts closely.

Who's bike is that? How did it happen?

http://fixedgeargallery.com/forum/viewtopic.php?t=18139

i've had a couple bike combo's that have been that close and never had a problem. miche cups are floating, so why not just pull the drive side over if you are concerned.

ITs all just a bit too tight, 2mm on the left and 1mm on the right. 110 should ease it out enough.

I think mr_tom's point about heel clearance is a good one. Not a problem if you have toes.

So. Too tight? And how do I solve it.
ISO sq taper.
FWIW, trialled 111 (record Pista) and 115.5 (Chorus), pictured.

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I had this the other day. There was enough flex when actually riding that the crank hit the chainstay. Switched to a slightly wider BB.

I don't think a wider BB solves it though, as they're mostly extended on DS, afaict.
@gbj_tester can you confirm the above

they're mostly extended on DS

Depends who, and how long. AFAIK, it's mostly just the very long (>120mm) BBs which are asymmetric.

Too tight?

Ride it and see. Frame stiffness and to some extent riding style will determine whether the crank and chainstay bend enough to meet in the middle

And how do I solve it

Hammer the chainstay or file the crank 😃

Too tight?

If you're going to the bother of posting here, with a photo, you already know the answer.