That one (triangular) unit is the only rear 180 P/P brake adapter that will work on my bike.
Did you try a SM-MA-F180P/P2 or a SM-MA90-F180P/P ?
Looking at your post mounts I can see no reason at all why either of those adapters would not work.
I didnt post wrong info really.
I posted info about the alternate model of rear brake adapter my bike 2012 (not exactly old) and many bikes require.
You said the SM-MA-F180P/P2 adapter doesn't work on rear post mounts when it does.
You also said the only adapter that works on your frame is an old superseded model that's hard to find.
You can claim that shimano never intended it to be a rear adapter but yet many thousands of new specialized bikes are equipped with this as a rear adapter and its the only one that fits.
So I dont think your clain is accurate that its Not a rear used as adapter.
Because it is by my manufacturer did and apparently there are some people other on the forum who need them for their bikes too.
Like me, for my 2012 Camber.
When these adapters were first made there was no frames with post mounts on them, that's why they are called 'Front' adapters.
Shimano hasn't bothered to change the model code for these adapters to indicate that can be used on front and rear post mounts.
The code for these adapters also doesn't take into account that not all post mounts are at 160mm specs, when the 180mm adapter is used on 140mm post mounts it's a 160mm adapter not a 180mm adapter.
Avid used to call their 180mm post mount adapters a 'F' or 'Front' adapter, they have since changed the name of these adapters to '20mm Post' because it can be used on front and rear, it can also be used on different size post mounts too. On 160mm post mounts it increases the rotor size by 20mm to 180mm, on 140mm post mounts it increases the rotor size by 20mm to 160mm.
I very much doubt the SM-MA-F180P/P is the only adapter that will fit on your bike as you've said.
Parts manufacturers have been known to supply bike manufacturers with old discontinued stock at cheap prices to get rid of it.
I recently had to buy one of these Rear 160-180 P/P adapters and there was only one site on the internet that had this model:
Shimano 180mm Ft. Post To Post Adaptor
It's an old superseded model, that's why it's hard to find.
Shimano retired it for some fool reason, probably the same greedy reason they started ispec-b and stopped making the old available anymore.
Maybe like several other companies that used to make similar adapters, they realized that they could make a lighter weight adapter that did the same thing and only needed to use two bolts instead of four.
.........
I didn't intend post wrong info really so I understand why you wanted to clarify that this adapter can be front or rear.
Last edited by Trail_Blazer; 6 Hours Ago at 12:43 AM.
Maybe you should edit some of your other posts too?
I'm not trying to start something but you did add confusion when you respond to my post saying that I bought the wrong post adapter.
I have the correct adapter for my bike and rotor size.
I didn't say you had the wrong adapter, I said you could of used any of the three Shimano adapters that you previously mentioned.
Remember the following thread?
http://forums.mtbr.com/brake-time/160-200mm-brake-adapter-919684.html