113 or 118 octalink BB pls help? – Singletrack World Magazine

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This topic has 8 replies, 4 voices, and was last updated 14 years ago by avalanche.

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113 or 118 octalink BB pls help?
avalanche
Free Member

I want to fit some old Shimano octalink cranks to a hardtail. 68mm BB shell. Is there a way of measuring to determine BB axle length? How critical is it to get it correct as 5mm difference equates to 2.5mm each side?

Posted 14 years ago

StuE
Free Member

What cranks are they ?

Posted 14 years ago

uplink
Free Member

What model cranks are they?
The info for the required BB is often on the Shimano site

Posted 14 years ago

avalanche
Free Member

The logos are worn off. I think they are old LX before HTII. I'll check out the Shimano site.

Posted 14 years ago

thekingisdead
Free Member

113 for triple, 118 for single ring.

the 5mm is to get the correct chainline.

Posted 14 years ago

uplink
Free Member

LX were a bit odd for [at least] one of the year models
121mm IIRC

the model number should be stamped on the inside of the arm where the pedal threads are

Posted 14 years ago

avalanche
Free Member

Model number is FC-M510….

Posted 14 years ago

uplink
Free Member

look here

http://www.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50rparsys-0032-downloadFile.html/05%29%20Crankset%20and%20BB%20Combination%20Chart.pdf

Posted 14 years ago

avalanche
Free Member

Cheers uplink. What chainline will I be looking for 47.5mm or 50mm?

Posted 14 years ago

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