BB30 -> GXP adapter - what's going on here?

02gf74 · Oct 13, 2016

My understanding is that a BB30 -> GXP adapter fits into the bearing fitted to the BGB30 bottom bracket (see here: https://www.amazon.co.uk/Wheels-Manufac ... B003TOUUYK - these are delrin inserts.

so what is going on with this one - it has additional bearing races fitted - any ideas?
http://www.ebay.co.uk/itm/301853605189? ... EBIDX%3AIT

hamster · Oct 14, 2016

if I understand it right the Amazon one is a reducer that fits into the BB30 inner race to allow the slimmer shaft to fit. The second is a complete press-fit and reducer unit that replaces the BB30 bearing.

02gf74 · Oct 14, 2016

I would have said that too except they look identical to me.

I contacted the seller and response was "no need to remove the bearing" which implies the ebay one fits to the bearing and has an additional bearing. (it seems most strange). :?

mechanical_vandal · Oct 14, 2016

02gf74":26s5lyk0 said:
I would have said that too except they look identical to me.

You shoulda gone to specsavers, they are different diameters, one is one piece, the other multiple pieces, including a bearing.

As already suggested, Amazon one fits into the BB30 bearing to alter the ID, eBay one is a complete replacement unit.

Neither of these will do anything to alleviate the problems that come with bb30 though, you really want something like the Praxis adapter that screws together/expands.

BB30 -> GXP adapter - what's going on here?

02gf74

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hamster

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02gf74

Old School Grand Master

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mechanical_vandal

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