sisl and pf30 BB compatability

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logy
Posts: 139
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Hi All

After having just the bearings replaced badly in my Super Six Evo SRAM pf30 BB I was advised to go for a Wheels mfg unit and this was fitted yesterday. The seals that came with the BB are not compatible with the Si cranks, the wave washer completely compressing when torqued up. Cannondale seals allow use but leave a gap between seals and bearings.

Does anyone have experience of replacing the BB with these cranks? What's the best BB?


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mrlobber
Posts: 1928
Joined: Sat Oct 23, 2010 9:36 am
Location: Where the permanent autumn is

by mrlobber

Essentially pressfit BB's are bearings (of the same diameter and width) pressed into frame + bearing shields + spacers/washers.
If your previous bearings went toast, replace those and reuse the previous seal + spacer setup.
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xena
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by xena

I have SISL2 crank fitted on my Guru ... Wheels mfg unit,,,the top of the range ceramic bearings, angled etc etc .

Bike is still being built up but there was no issues with fitting the crank etc. I got my friend Tony to fit the crank ,he has many years experience and has fitted countless press fit cranks. It does not spin crazy but feels very smooth.

The Sram BB should be avoided.
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Valbrona
Posts: 1629
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

I might have automatically chosen an FSA BB to use with an Si crank.

When recently using a Wheels Mfg adapter BB in a BB30 shell I noticed that the seals were rather thick, which will of course impact on function if the system involves the use of a wave washer.

logy
Posts: 139
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Yes the seals are too thick. I will now revert to an FSA unit. As is, the crank nearly hits the front mech, approx 2mm clearance. Not good.


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Valbrona
Posts: 1629
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

With straight crank arms alignment can be critical. Check out the tech docs: https://s.yimg.com/fz/api/res/1.2/q5dFs ... =75&maxy=0

r3awak3n
Posts: 68
Joined: Wed Feb 11, 2015 11:44 pm

by r3awak3n

I am running the sram pf30 BB with no problems at all.

logy
Posts: 139
Joined: Fri Jun 03, 2011 6:30 pm

by logy

SRAM bought and will be fitted soon


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logy
Posts: 139
Joined: Fri Jun 03, 2011 6:30 pm

by logy

SRAM fitted and runs ok it seems. Are people using he sram bearing covers or Cannondale? Also what is the space to the front mech? RED 22 has low clearance.


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r3awak3n
Posts: 68
Joined: Wed Feb 11, 2015 11:44 pm

by r3awak3n

I am running the supplied Sram bearing clovers on my sl

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