ISIS BB Sizing - Trek 1.5

WhyteFox said:

Does anyone know what size BB I need? I have a feeling it's 68mm by 108mm but need confirmation!

Either 108mm or 113mm ISIS BB spindle will work with a double crankset on a road bike frame that typically uses a crank with a (now-standard) 150mm Q-factor.

The ISIS BBs that I have/use with my road doubles are 113mm because they were more readily available at the moment in time AND the 2.5mmm wider-on-each-side crank is inconsequential to me.

On a frame which has a 135mm rear spacing, I use a 118mm ISIS with the double to allow the crank arms to clear the stays.

WhyteFox said:

Hello

Can anybody help me with the sizings of ISIS BBs?

I have a Trek 1.5 2009 model and despite the tapered BB and FSA Vero cranks I'm more than happy.

So I tootled off to Chain Reaction and bought the FSA SLK Carbon Chainset:

FSA SLK Carbon Chainset ISIS | Buy Online | ChainReactionCycles.com

Now I need to find a decent ISIS BB...but road BBs don't seem to be as straight forward as MTB BBs.

Does anyone know what size BB I need? I have a feeling it's 68mm by 108mm but need confirmation!

Cheers!

Yes an english threaded, 68mm(BB shell width) by 108mm ISIS BB for this crank. Get a couple as these are leaving the market pretty quickly.