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@Sano
I've been considering the input you lot have kindly given me and I'm going to have a crack at converting the GB I have. It's got near horizontal dropouts, so I'm guessing it's going to work OK. I'm intending on getting to grips with it all to learn bike mechanics better, ride it around for a bit (it is a bit big), then move on... Reading this site has inspired/doomed me to a life of expensive bikes : )
I don't want to spend too much money on this thing, so I'm going to reuse as much as I can off the original bike, but the obvious thing for me to work out is the rear wheel. It seems to be about 130-134mm between the dropouts, does anyone have any suggestions as to a wheel that would do the trick?
There's a campag crank on there - I think it's a cheapo one - with five arms to the spindle. Is there a regular campag chainring pattern (like there is with Nikon lenses) or are they all different? Any recommendations for a suitable chainring?
Lastly, gearing - I'm don't exactly have powerlifter's legs but I'm not skinny, either. What's a reasonable gearing for London riding?
Thanks for the help, ladies and gentlemen!