I recently bought an Avid BB7 road disc brake which was on the vendors website described as Post Mount. It came in a box saying that it was IS mount and when I opened the box there was a PM brake caliper with 2 different IS adapters and a SRAM 160 mm disc rotor. The thing is that without a PM/PM adapter the brake won't fit the supplied rotor. The cost of an Avid adapter is £25, making an expensive brake caliper a very expensive brake caliper. I messaged the vendor saying that I wasn't happy with the description and the fact that I had to spend an unexpected £25 to make it work and anyway,when did disc road bikes ever have IS mounts to which I was told plenty of older road bikes use them which I would dispute. Do you think that I'm being petty?
Third time the charm perhaps..
Yes but you also need the long bolts to actually fit it. My LBS only had the official SRAM part for a pricey £25, although I haggled them down a bit.
It's pretty normal to need to buy an extra adapter to make the caliper fit a particular disk size. It's not normal to pay £25 for it.
Every Avid disc brake I bought came with a selection of PM-PM adapters (including the right size bolts) so that you could set the caliper correctly for the included disk. Mind you offhand those I bought were all 203 disks so may have included more adapters...
Front and rear, so a tenner a wheel. Cheaper than sourcing individual washers and bolts from eBay.
