Converting a F650GSA from 19″ to 21″ front wheel?
A. I assume you are going reuse your hub. I’ve seen bikes that have been done so maybe they will be able to give you some detail beyond this. I offer this; Call a good wheel shop (references in the FAQ) and get a quote. You can do this yourself but it’s a lot of work. All it takes are new spokes, new rim, tube and tire. Additionally you will have to raise the cross brace on the forks about a 1/2″. The Dakar has this mod. stock. The spacers are about $10 each from BMW. You may also need longer bolts. That is pretty much it. FWIW the lower forks, hub, brakes, etc. are identical between the two models. The 21″ rim is a little narrower and the typical 21″ knobby tire will be narrower. You’ll give up a little braking and cornering. Your handling will be affected slightly by the 1″ rise. You could lower the forks in the triple clamps a little to compensate. I can assure you that the lower external half of the forks are identical on both models. The entire wheel assembly is identical except t
