Hey,
Currently building up a roadbike for my partner. It uses a 68mm external T47 BB & I have opted for a 24mm spindle. The cranksrt spindle is about 110mm wide. When the NDS is tightened to 40nm, there is still a good amount of spindle left, too much for spacers to fix, no?
Also drive side crank seems quite close to the FD. Could th NDS thread be cut wrong, so the crank never engages correctly? Or does the crank only work with certain BBs?
Pictures attached, also with the crankset specs.
Thank you guys! 🙂
by SnookBiking
14 Comments
I’d try a pair of spacers each side just to be safe. That might make up the bulk of the free space on the crank. Shimano ones usually come with a thick 73mm spacer and a thinner one. I’m not sure about yours though.
Otherwise if that still doesnt work then you’ve got the wrong version of the crankset
Why don’t you link the actual product that you bought?
You also probably bought the wrong version of it. When it says 68-73, it usually means there is a 68 version and a 73 version. It’s not adjustable between the two.
How much extra spindle do you have? 5mm? Looks like maybe even more.
And, yeah, link to the bloody product, not an image of a partial spec sheet.
The last pic it says, crank is for 68-73 mm wide frames. Typically, roadframe are 68, so there is some of your excess axle. The rest should be able to be covered by a spacer and the adjustment ring.
I had the same problem with a chinese crankset (Zrace), that was delivered with what I regarded as a too long axle. This crank was a “sram dub” style crank. I bouht a sram dub left crank arm (that holds the axle) for cheap on the used market and combined them.
Its looks normal, don’t worry about that
There is a chinese crank manufacturer who likes long shafts, had to source spacers too.
The bike has a 68mm BB and the crank spindle is for a 73mm BB. The product states for 68-73mm BB. If you have a 68mm BB you will need spacers. If you have a 73mm BB you will need no spacers. 10MM in spacers is pretty normal for this kinda set up. I would try a 5mm spacer on the Drive side and a 3 mm spacer on the Non Drive side. If still loose work your way up to 10 mm in spacers.
Spacer behind the BB cup required as well as your spindle spacers.
* The preload adjustment will take some of the slack, but not all.
* Make sure cranks arms are spaced equally far apart from the frame chain stays, so you don’t get an assymmetric bike fit.
* I’d rather space the BB cups than the axle to have the bearings further out.
Did you tried to put a folding bike crankset to a road bike?
I bought two of these exact same cranks set, on bb68 I had to use 2 of the 2.5mm spacer that came with the BB. But still I got endless creaking from it and ended up overtorqued the crank and lost the threads. Replaced both of them.
You should have measured where your chainring was when you took it apart because that is the critical lateral alignment. Because you have a 68-73 BB it uses spacers to make up the difference. Because you are 10mm off I would guess you have a 5mm spacer on the wrong side. Look for a 5mm spacer and move it to the drive side if you have one. You may still be off by 5mm but that is because this BB is designed to fit both sizes and is slightly longer than a straight 68mm BB.
I have the same crankset, it is for a 73mm wide shell. I had to put two 2.5mm spacers on the non drive side, because my frame has a 68mm wide shell.
https://preview.redd.it/d93pyudxi8lf1.jpeg?width=4032&format=pjpg&auto=webp&s=70ef57099e623f28d065eb18a08dcf559462d4ab
I would guess you need bottom bracket spacers. I think the Shimano Hollowtech II calls for three for the 68mm BB.