50 mm sounds a bit much for a old pug road frame. That is the chain line for a middle of a mbt chain set.
Yes a new bottom bracket is required. Remember that a b.b is symmetric (well most are there are some out there that are not but rearly) so if you wish to move the chain line x mm you need a b.b which is 2x mm shorter / longer.
50 mm sounds a bit much for a old pug road frame. That is the chain line for a middle of a mbt chain set.
Yes a new bottom bracket is required. Remember that a b.b is symmetric (well most are there are some out there that are not but rearly) so if you wish to move the chain line x mm you need a b.b which is 2x mm shorter / longer.