Getting a BB30 24mm spindle to work with a PressFit 30 bottom bracket - how?

FrankGrimes

My new Cannondale Supersix Evo came with a PressFit 30 bottom bracket and I’m looking to use my Dura Ace 7950 cranks/chainset as it’s got an SRM power meter built in. I’ve taken the cranks/chainset off the bike (they’re on sale here) and the diameter of the opening in the PressFit 30 bottom bracket looks to be 30mm. The diameter of the axle/spindle on the DuraAce cranks is 24mm. So I think I need to get an adapter sleeve to fit that axle in the press fit housing, but also probably need some sort of external adaptor also as the press fit cranks are secured differently to the BB30 setup (which has cups that protrude beyond the side of the frame whereas the PressFit 30 cups are recessed inside the frame).

Does anyone know what sort of adaptor(s) I need or if this is even possible or know a man/store that does? Thanks for any tips – I’ve got this brand spanking new bike I haven’t yet been able to take out for a spin so the anticipation is killing me!

lennymc

i think the srm is a bb86 (one of shimano's press fit standards, iirc they have bb86 and bb92) so you will need a bb86 to bb30 adaptor. This is all off the top of my head, so check it out elsewhere. hth. I dont know of any, but im sure its been done.

edit - http://wheelsmfg.com/products/bottom-brackets-front-drivetrain/bb-adapters.html

jdt101

This should do:

http://www.bike-discount.de/shop/k410/a51741/race-hollowtech-ii-ceramic-bottom-bracket-pressfit-30.html

Chips Lovell

Yep, adapters are available. Something like what jdt 101 linked to is what you need, although I'm sure you'll get one cheaper if you opt for steel bearings.

BB standards are getting tricky to keep track of, with the multitude of pressfit (BB30, Pressfit 30, BB86/92 etc.) standards now emerging.

Bikengolfer

These adapters will work in the existing bottom bracket, http://wheelsmfg.com/pressfit-30-shims.html.

kumate_champ07

lots of adaptors here: http://www.bdopcycling.com/First-Bottom%20Brackets.asp#PRESSFIT30HOLLOWTECHII

FrankGrimes

Thanks a lot for the advice and links folks, big help - that helped me understand exactly what I was looking for and what my options were - ie. an adaptor to add into the existing cups or a new bottom bracket with a 24mm opening.

I've gone ahead and ordered some adaptors on Wiggle as it's the best chance of getting here before the long weekend and I want to get out on the new bike if at all possible.

Have my doubts about how well the adaptor will work so may end up going for a new bottom bracket in the long run, but if it gets me up and running for thirty quid and lasts for a while, that'd be perfect.

macnab

Hi Frank, any updates on this? How did you get on with the adapters?

FrankGrimes

I have these and they're working out fine. I do have a mystery creak on the bike but not sure if it's headset or bottom bracket. Easy to install and no issues to-date. Overpriced for a lump of plastic but do the job: http://www.wiggle.co.uk/wheels-manufacturing-bb30-to-24mm-crank-spindle-shims/