Anyone know the q-factor on the Sram Red BB30 crank? I saw something say that it was 145mm, but wanted to confirm this. I can't find anything in the Sram literature.

for the record, if anyone knows the Q-factor of a cannondale bb30 and cannondale alum crank, i would much appreciate that as well. i seem to be having some issues compared to when i ride my six13 with a 7800 crank. just curious. thanks....

If it is the Hollowgram crank you are talking about, I've seen them listed as 144mm. The DA 7800 is 146-147 depending on the source of the data (Shimano vs. Fairwheel crank shootout).

Sram cranks are 150mm and they bother my knee compared to my 7800 or 7900.

The same problem occurred with my wide Sram Red cranks. Those I ditched within 2 weeks in favor of Shimano. I've even been riding cranks with a Q-factor as low as 139mm. Biiiig difference.

I read somewhere that the BB30 version of the Red cranks have more favorable (to me at least) Q-factor of 145mm.

I read it in the new Velonews. It shows the Red BB30 cranks as having a 145mm Q-factor, but it also lists the standard GXP bottom bracket Red crank as having a 144mm Q-factor. I know for a fact that the GXP Red cranks I have are 150mm because I've measured them myself. I wonder if Sram changed the cranks or if Velonews if measuring them wrong?

I may have answered my own question. I found this on the Sram site: http://www.sram.com/node/190/brand/sram-road/src/series

The SRAM crank is at least 160mm++ above. I believe it's 167mm

The lowest Q-factor os 147mm by campagnolo ultra-torque and shimano is 150mm++(can't recall). SRAM is the highest-> no surprise.....Taiwan made crank...what you expect

do asians have wider hips/stance widths than italians or something?

Starnut

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Q-FACTOR IS A RED HERRING

BB30.COM

I just measured mine at 148mm.

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Extralite QRC is 138mm for BSA BB

The widths I have are:

Sram: 150mm
Shimano: 146mm
Campy: 145mm

I measured my Red cranks in the garage and came up with 150mm. The Shimano 7800 and 7900 I have are both 146mm. This is measuring from outside edges of the crank arms. I mount the arms directly across from each other (not how you would want to ride it) and measure straight across. I *guess* it could be different when you mount the arms the way you would for normal riding, but I would doubt there would be any difference.

I'm really just trying to make sure that the Sram Red BB30 truly IS 145mm. Call me vain, but I want the group to be all matchy-matchy. I have some Hollowgrams that I can use too. (Go ahead and flame me Starnut!)

What cranks are you using that go as low as 139mm? Square taper?

These:


Haven't ridden square taper since the 90s.

can someone measure for me diffrent BB30 cranks q-factor ?

-sram red/force
-fsa
-SI

i dont believe the figures on the websites.