2x10 XX and XO ring diffs?

[kosmonooit]

Anyone know off-hand the compatibility between the SRAM 2x10 XX and X0 cranksets in terms of 'spiders' and chain rings? Are they interchangeable?

 

Doing my 1st 2x10 build -decisions, decisions, decisions!

 

Also, what are your thoughts in terms of 170 vs 175mm crank length? I am thinking 170 might just make it easier on the climbs. I am going to need that on the 2x10.

 

Q Factor? 156 or 164? Its a 26" Flash frame that's going 650b, thinking of 26/39 rings.

 

BB30 or PressFit-30?

 

 

Please no suggestions of 1x11, not ready for that yet.

Edited July 30, 2013 by kosmonooit

[Captain Fastbastard Mayhem]

175mm cranks will increase your leverage ratio by a bit and make it a tiny bit easier to climb due to the reduced pressure you'll have to put on to the pedals to get the same rotation.

 

 

[Captain Fastbastard Mayhem]

Don't know the rest without looking it up though, sorry Kosmo.

[PhilipV]

I think XX and XO are interchangeable. might be wrong.

on my bike (26) I had a 28-42 with an 11-36. if you spend a lot of time in the granny on your triple crank the 26-39 might be better, but I honestly think it is not worth it.

Riding 26t with a 34t cassette now and when everything is worn out again i'll go back to the 28 crank combo.

[kosmonooit]

Okay so XX is 120 and 80mm BCD Four Hole so any 10-speed chain rings with those specs will do, Doesnt look like there is a spider system on XX. But X0 has. Why?

 

 

Crankarm Length: torque is force x distance/radius, so for a given force (your foot on the pedal) more torque is result of a longer crank arm length, but a slightly greater pedalling circle (all of 10mm). Thus 'easier' up the hills? Thought "Compact" cranks was supposed to make pedalling easier... pffft.

 

Does it / will it really make a difference to a below average kippie such as myself, if I can get 170mm cranks for a 1/3 the price of 175? w.t.f.

Edited July 30, 2013 by kosmonooit

[jannosmit]

Compact does not refer to the 170mm, it is smaller chainrings, which makes it easier up the hills.

[kennyg]

26"flash, is BB30 168, recommended.

 

28-42 on a 26 inch for the rings, on 11-36 cassette, going

 

The whole XX spider should be intercahangable to XO cranks, I havent checked I think it works.

 

[kosmonooit]

Thanks Ken, going 650b on the Flash 26" frame but going to start the smaller chain rings and 11-36 Cassette is in the post. Been digging to solve the spider mysteries, info has not be forthcoming. Why is there a spider? Only reason I can think is to change chainrings quicker, one might have a spare with another set on with different ratios that you can change when you need to without have to fiddle with those bolts.

 

Seems PF30 and BB30 a matter of choice, What's the advantages of the PF30? have worked with BB30 on my Scalpel, that seems str8 forward.

Edited August 1, 2013 by kosmonooit

[Stretch]

Chainrings are totally interchangeable...that said the xx chain rings are not that much more than xo so it is easier just to but those