Questions tagged [square-taper]

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Understanding Shimano UN55 spindle dimensions

A long time ago, I found a document or a forum post that gave me the information I require. However, I can't find it now so I hope one of you knows the answer. Take the normal bottom bracket, BB-UN55, ...
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4 votes
2 answers
501 views

Shimano pre-greased crank: where to spread the grease?

The Shimano Altus FC-M311 crank comes pre-greased with four generous drops of grease on one side of the crank's thread (the yellow circles in the image), but it's unclear where it should be used: on ...
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5 votes
2 answers
231 views

Replace an FSA Powerdrive Bottom Bracket and Crankset with Square Tapered

I have 2012/2013 (alleged) Kona Ute. I need to replace a the crank arm due to stripped pedal thread. It currently has an FSA Powerdrive 118mm/68mm Bottom Bracket. I am not 100% certain but I believe ...
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5 votes
1 answer
447 views

Why does the 'try other positions on your square taper spindle' trick work in reducing chainring wobble?

Example here: Does this mean that there is a manufacturing defect in the spindle/BB/crank? Or damage? Or is it just the nature of these things that there will be one ...
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4 votes
2 answers
244 views

Square Taper BB Upgrade as Part of Groupset Upgrade

I want to upgrade my bikes groupset to a Shimano 105. I currently have a "sealed cartridge, square taper, steel spindle, steel cups" bottom bracket. Will this be an issue upgrading to a new ...
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7 votes
4 answers
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Drive side part of bottom bracket is impossible to remove and has destroyed tool fitting

So my old cartridge bottom bracket is about fall apart and i bought a UN55 to replace it. The plastic non-drive side was very easy to remove, but the drive side is literally impossible. I let it soak ...
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5 votes
1 answer
3k views

What types of BB-axle to crankarms interfaces are there?

On the lowest end, we have the taper/square interface. I believe it is standard i.e. there are no variations in the sizes. image property of VP Components USA Then there is the Octalink. Actually ...
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