I picked up an old Bianchi Giro that was missing various original parts, including the limiter screws for the rear dropout. How important are these? Should I replace them and if so, where can I find a pair?
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
They were intended to make fast wheel changes, as during a race, more precise in the days of horizontal dropouts. Once the screws were adjusted properly, just slamming the new wheel back against them guaranteed it was in the right place and properly aligned.
They aren't essential but can be a convenience. I believe their threading is M3x.5 mm