tight chainstay clearance on my lynskey Ti allroad!

[CAAD]

Yikes, I thought my GXP stages arm was cutting it close, no issues to speak of. Time to swap cranks. Lynskey builds a solid bike I willing to bet the frame is just fine.

[Black Dog]

Originally Posted by wallymann

my recollection is that the lower-tier solid-core UT carbon cranks like athena/centaur dont have that inward/medial bulge on the ND crankarm. so i'll be searching for a compact version of them!

EDIT: i just did a quick comparo between my records and chorus UTs and the medial ND bulge is definitely in a different, more chainstay-friendly location!

You do not need to buy a compact chorus crank set. As long as the arms are the same length you can just put on the chorus NDS arm with the Record DS arm.

[unterhausen]

there is no way to test the alignment on this bike that would address the location of the bend in the stay. Hard to know if they precisely control the place where the stay hits the bb shell or not, or if there is variation in the stay bends. You can't judge by symmetry, because it's an asymmetric design. People are building asymmetric rear triangles nowadays because it's hard to fit the chain rings and a big tire together as closely as people want. Trek has at least one gravel-oriented model with asymmetric chain stays, and I'm sure there are others

[wallymann]

Originally Posted by unterhausen

there is no way to test the alignment on this bike that would address the location of the bend in the stay. Hard to know if they precisely control the place where the stay hits the bb shell or not, or if there is variation in the stay bends. You can't judge by symmetry, because it's an asymmetric design. People are building asymmetric rear triangles nowadays because it's hard to fit the chain rings and a big tire together as closely as people want. Trek has at least one gravel-oriented model with asymmetric chain stays, and I'm sure there are others

totally agree. chainstay/crank clearance these days has basically nothing to do with BB centerline symmetry. take a look at allied's gravel bike:

[robt57]

Originally Posted by Black Dog

As long as the arms are the same length you can just put on the chorus NDS arm with the Record DS arm.

You don't know Wally very well.

[robt57]

Wally asked me tire fit questions, My CX-Pro been together for a while now.

It's wearing Soma 38 Supple Vitesse. So I grabbed a tire off the wall mounted it on a 622x20c wheel and tossed it on.
A 29er tire, too.

I expected it to hit before I got the TA holes lined up. It did not.

Talk about monster CX.

So for anyone wondering What a Pro CX is capable of to the greedy side, there it is.

I actually got it for 47x650b due to the higher BB than a true gravel bike. Plus I hate a slow front end...

[DfCas]

Is the tire closer on the non drive side or is it an optical delusion?

[wallymann]

Originally Posted by DfCas

Is the tire closer on the non drive side or is it an optical delusion?

looks wonky, must not be in the D/Os fully

[robt57]

Originally Posted by wallymann

looks wonky, must not be in the D/Os fully

Optical delusion. Actually, the TA axle is not tightened.. Not to mention I do not intend to ride it, so tire may not be uniformly seated either.

[Plum Hill]

Regarding photo in post #28: something looks amiss at the crank arm/bb cup area. Arm doesn't look parallel to cup, like the bearing is cocked in the cup.

[wallymann]

thanks to mr. thwart i got a set of 10spd chorus UTs. and the clearance situation is much improved. we're at like ~5 mm, which to me is plenty. looks tighter in the pic than it actually is.

fwiw...i've ridden steel bikes with relatively flexy super-record cranks with 2mm clearance to chainstays for years (and this was +30 years back when i could actually put out some power), so this much clearance and my older/pathetic power output will be absolutely fine.

[wallymann]

Originally Posted by Plum Hill

Regarding photo in post #28: something looks amiss at the crank arm/bb cup area. Arm doesn't look parallel to cup, like the bearing is cocked in the cup.

thats down to visual parallax distortion. the cranks are square to the BB, as the central fixing bolt is holding the half-spindles tight!

fwiw...here's the prior comparison image:

[C40_guy]

[QUOTE=ntb1001;2658804]I wouldn’t be surprised if it’s just a Campy issue.
I used a Dura Ace direct mount under BB caliper on my Parlee and my Campy crank wouldn’t clear the caliper arm.

/QUOTE]

Wait, a U brake? I have one of those on my '86 Wicked Fat Chance.