If you ride a late model GSXR 600/750 or R6... AND you change your own wheels... you really should have one of these!!!
If you want to measure the axle diameter (of the ID of the caliper hole) AND the inserted width that the tool needs to be (caliper and swingarm)... I can make you one for your 636.
I will vouch for Piper... I bought two of them and the fit was perfect for my 06 gsxr 600.. the brake caliper stayed in place and my normally frustrating rear wheel change went much smoother than it ever has... Two thumbs up..! If you don't have one of these you are definately missing out!
Matt, Your caliper tool will ship out in the AM... Everyone else... If you ride an 06 or later GSXR 600/750 or R6... you NEED one of these... I have 20 more rear brake caliper tools ready to ship. shoot me a PM if you want one, 30$ (paypal) shipped:up: