Unchain my bike... or so I thought... Hans Renold is credited with inventing roller chain in 1880... but here we are 127 years later and bikes are still laboring under a steely... heavy... clanky... messy... chain... Mercy me chains are a pain... belts spell relief... and so my belt drive conversion starts with an engineering drawing... Gates Poly Chain comes in 3 belt sizes... 14mm pitch is what HD employs on their cruisers... 8mm is what I used on the VF500 Belt-0-Ce