I have gained lots of experience working on Sturmey-Archer, Shimano and Sachs internal hub gear transmission systems – in 3, 4, 5, 7 and 8 speed varieties – plus I have plenty of spare parts in stockContact me if you’re looking to change your ratios, have a hub overhauled, get a custom wheel built around a internal geared hub, or are just need a tune-up to prevent gear slip!