Bike Forums - View Single Post - The Effect Of Crank Length On Performance
Old 10-25-18, 02:56 PM
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Originally Posted by rensho3 View Post
I am 5"5" tall and currently using 165 mm cranks. I am thinking of changing to 150 mm for next year. I haven't been very successful in finding a 155 mm set in 144 BCD. Does anyone have any suggestions?
The Rotor ALDHU comes in 150 and 155mm. To put together a crankset for a BSA 68 track bike, you need :

Crank arms
Track Spider
Track 30 Axle
BSA30 Track BB

Beware and get the correct bottom bracket. The axle is 30mm, so get the new track BSA30 BB with the red seals, not the older 24mm track BB with the blue seals (online vendors may not yet know the difference). The Rotor rep said the road BSA 30 does not work.

Also, the spider is thin and not countersunk for captive nuts. Dura Ace chainrings don't cinch down with normal track bolts. FSA are reported to work as well as the Rotor track chanirings.

The older Rotor 3D24 crankset came in 155mm. The spider is removable, and one version of the Power2Max track powermeter used the Rotor 3D24 road crankset. 24 refers to the 24mm spindle. Power2Max also offered a track powermeter using the Rotor 3D+ crank set which used a 30mm spindle. That's what is shown in the Ken Lo photo above.

Originally Posted by tobukog View Post
You can pretty much use any correct length 3d+, 3d30 rotor crank and buy the 144mm spider separately.
The 3D+ road cranks are currently on sale on the Rotor website, so this may be a good way to go.

Check to see if you need a special tool to replace the spider. I know the 3D24 did.

Last edited by gl98115; 10-25-18 at 03:15 PM.
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