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UN55 bottom bracket size query

ade555ade555 Posts: 216
edited November 2015 in MTB workshop & tech
Hi

I need now bottom bracket for my daughter apollo bike, the current one have cups and bearing so looking to replace with seal cartridge, like Shimano UN55, I measured and looks like will need 70mm x 117 but I can only find 70mm x115, but then I got a bit confused about English and Italian Thread :( , anyone can put on right track?

Thanks
Ade

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