Originally Posted by TimothyH

Yes, there are longer bolts. Shimano makes several lengths. The exact bolt you need depends on your model caliper. Different caliper models take different bolts. What model caliper are you using?

Part numbers for each length are in the exploded view document for your model caliper at Manuals & Technical Documents.

Worldwide Cyclery has large selection of caliper bolts. Find the correct Shimano part number for the length you need in the EV diagram for your caliper and search the Worldwide Cyclery website for that part number. Chances are they will have it. I purchased a couple extra and glad I did because I stripped one. Actually I stripped the adapter but didn't trust reusing the bolt.

This is a photo of my Niner RLT 9 RDO build. I'm using RS805 calipers. You can see the two different length bolts. I needed longer ones for the exact reason you do - the calipers come with bolts for 140 mm rotors but I built with 160 mm rotos and used the spacer under the rear caliper.

See post number 64 at Niner RLT 9 RDO Build




-Tim-