Hope Caliper Information - International Standard I.S 51mm Numbers 3 5 8 & Disc Size Compatibility

Disc size compatibility for Mono I.S calipers 2004+
https://www.hopetech.com/_repository/...

Disc size compatibility for 2 Piece I.S calipers Pre 2004
https://www.hopetech.com/_repository/...

Some extra information taken from a post by dyna-ti, a member of the Single Track Forum. (I think this relates to mostly C2 calipers)
Caliper #1: This is a special caliper that is used when no disc mounting tabs are on the frame/fork. Example: 1998 Pace fork, with tapered leg, and 155mm disc.
Caliper #2: This caliper is to be used on frames with no rear disc brake mount. The rear rotor is 155mm.
Caliper #3: This caliper is to be used on the front with 185mm rotors or on the rear with 165mm rotors.
Caliper #4: This caliper is to be used with 1997 Marzocchi Z1 and Z2 forks with a 185mm rotor.
Caliper #5: This caliper is to be used on the front with 165mm rotors. Rear 145mm
Caliper #6: This caliper is to be used with ’98-’00 Rock Shox Boxxer forks. Rotor = 185mm.
Caliper #7: This caliper is to be used with Answer X-Verts that do not have Hayes mounts and a 165mm rotor.
Caliper #8: This caliper is to be used on the rear with 185mm rotors.
Caliper #9: This caliper is to be used with Manitou forks w/ 68mm hole spacing with 165mm rotors (??). No adapter is required (bolts directly to the fork tabs).
Caliper 9:74. Post mount for 165mm rotors Front or Rear
Caliper #10: ???I’m the only person in the world to own the No10 caliper- a prototype for a 140mm rear cyclocross(Hope themselves likely have a few) though I’ve got the hub.
Caliper #11:74 This DH4 caliper is to be used with Manitou X-Vert Carbon forks. No adapter is required (bolts directly to the fork tabs). Post mount for 185mm

Caliper 12???


So yes, hope this help (no pun intended).
Older 2 piece I.S calipers 145, 155, 165, 185, 205mm compatible
Monoblock (1 piece), Mono(Mini), Mono M4 I.S calipers 140, 160, 180, 200mm compatible.
Mono 6 is an exception to the rule as that has it's own specific mounts.

Don't even get started on the various adapters. . .🙄
HBMB
HBIS20
HBIS40
& the other 20. . .
I.S to post mount
I.S to I.S
Post mount to I.S
Be glad that post mount pretty much removed the need for such complications.

Good luck.