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PostPosted: Tue Apr 22, 2014 7:47 am 
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Location: London, UK
dereksmalls wrote:
Sorry to drag this thread up, but can how fit a pair of Hollowgram SISL (which are BB30) onto a BMC SLR which is BB86? What sort of BB adapter would I need? Or should I just forget about it and get a Lightning crankset in BB86 straight away and avoid the additional adapter weight?

Don't think it will. The chain line is likely going to be 9mm off to the right if you can even get the cranks to fit using a longer axle.


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Posted: Tue Apr 22, 2014 7:47 am 


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PostPosted: Tue Apr 22, 2014 12:08 pm 
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Sorry derek that won't work. BB30 will take any modern crank (mostly) as it has the smallest width shell (68mm) and largest bore (30mm spindle) so a GXP crank which is designed around an 86mm BB width (BB86, english thread, BB90) will fit as it has the spindle length. The 24mm GXP spindle width will also comfortably fit inside the BB30 BB shell (24mm spindle instead of 30mm it was designed for) but will need adapters to reduce the cavity to only 24mm.

BUT a BB30 crank which is essentially 68mm wide cannot get through a BB86/english/BB90/GXP BB shell which is 86mm - it is 18mm short. You can make the 30mm spindle fit the BB86 shell, which is designed for a 24mm spindle but the bearings have to then be very small and will not last long, but that still leaves you without the spindle length. What about a hollowgram MTB spindle which is >130mm I hear you ask - well the q factor (width between pedal threads would then be massive and as ultimo said the chainline will be wrong -> the bike will shift like shit and you will have your legs spread like you are giving birth.

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PostPosted: Tue Apr 22, 2014 4:20 pm 
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derek,

So you are going to have to do some math and research, but it's my understanding that the raceface next sl axel is the same as the Hollowgram.

raceface makes a BB92 axel. worth looking into ....


C


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PostPosted: Tue Apr 22, 2014 11:14 pm 
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Joined: Tue Aug 02, 2011 9:20 pm
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Location: New Zealand
Cheers all. Seems like quite a bit of hard work so think I'll flag that one and just look at the Lightning crank in BB86 configuration instead via Fairwheel bikes, looks to be a whole lot easier.

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PostPosted: Wed Apr 23, 2014 6:02 am 
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Joined: Thu Sep 19, 2013 4:42 am
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Any Major difference in crankarm going from Sisl to Sisl2? Isn't it only minimal material shaving? If so, it seems not worth paying the extra cash for the updated version and actually cheaper to buy an older Sisl set and spider ring separately.


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PostPosted: Wed Apr 23, 2014 1:33 pm 
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The SI SL2 has about a 15g saving per crank arm. The Spindle is also longer, and the preload is all set on the nondriveside, so chainline is constant. The taper of the arms has been changed so q factor is apparently not affected.

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