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Thanks Whoosh, that's brilliant. I think 2mm bias towards the low gear sprockets will work, I doubt I'll ever use the top sprocket. regular 68mm BS threaded bottom bracket shell....stuff I'm used to! who'd have thought it! and a walking assist! frame to sort now!

Hi all New member piggy-backing on this thread as its pretty close to what I will want to do. (Hope that's OK?) I'm a lifetime touring cyclist, and I'm looking for a way to get a bit of assistance to replace the strength that the last couple of years have taken away. I live in Yorkshire and I...