Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

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Howard in reply to @hippy

I find out the SiSL2 cranks ARE the skinnier q-factor even without the shorter axle???

My understanding is as a system with the 109mm spindle, regardless of BB30 or BB30A, they had the same Q as the SISL arms on a 104mm spindle.

So this is correct:

By using the SISL2 with the new 109mm spindle bottom bracket assembly you will achieve the same q-factor of the SiSL.

So the SISL2 arms have reduced heal clearance by 2.5mm compared to the SL arms to compensate for the 5mm longer axle. I believe the 'new' Si arms are the same design.

As I said in the 'dale thread, you can use them with the 104mm axle but you might find they don't clear the chainstays. You might also need to machine off the stop on the axle and dick around with spacers.

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hippy in reply to @Howard

Yes, but what about the q-factor of the Si cranks on the 104mm axle?

I've not looked at SiSL only Si and SiSL2 cranks.

So, I guess the best thing is to get ANY set of arms and both the 104mm and 109mm axle and see if ANY combination fits? £££ >>>

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Howard in reply to @hippy

Yes, but what about the q-factor of the Si cranks on the 104mm axle?

If you are talking about the 'new' Si arms then I believe it's the same design as the SiSl2 arms and will have 2.5mm less than SiSl and what the design intended.

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