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In thinking of buying a discounted road bike with post mounted disc brakes. I want a frame that will be upgradeable and last a good while, and am wondering if post mounts are already a thing of the past? If i understand correctly shimano and campag only do flat, sram now do both... but possibly a step towards abandoning post mounts outright. Any thoughts?

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mattydubster [81 posts] 6 days ago
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I honestly wouldn't worry about it.  I have an Enigma Ecroix which has post mount brakes, I hope to keep it for many years yet and having post mount brakes on it doesn't bother me in the slightest.  For a start, it'll always be easy to get new brake calipers as it's still the standard in the mountain bike industry so there will always be plenty of upgrades available.  Secondly, I have always liked the look of post mount brakes, I think it's that fact that flat mount brakes look like they have far more metal in them, to bring the pads out enough.  They look like big triangular lumps of metal and I've never thought they made a bike look that nice. 

And another thing to consider is that whatever bike you get, there will always be something that comes along pretty quick that superseeds what your bike has (just look at the big push with through axles).  So just get the bike and have some fun on it.

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wellsprop [614 posts] 5 days ago
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Certainly no need to worry about it. Post mount disc brakes aren't going to vanish. I don't think we'll see post mount disc brakes included in R8000 R9100 groupsets (where flat mount is now the standard), but I doubt were going to see Shimano discontinue post mount callipers anytime soon.

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surly_by_name [551 posts] 5 days ago
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I think no chance of no more post mount based on ubiquity of post mount on MTBs. However, over long term you may have to buy caliper separate from lever. Or maybe someone somewhere really will come up with a flat mount (caliper) to post mount (frame) adapter. (Certainly if manufacturers want to stop making post mount calipers they will need to come up with a solution before all of the mountain bikers descend on them with pitchforks.)

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wellsprop [614 posts] 5 days ago
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surly_by_name wrote:

I think no chance of no more post mount based on ubiquity of post mount on MTBs. However, over long term you may have to buy caliper separate from lever. Or maybe someone somewhere really will come up with a flat mount (caliper) to post mount (frame) adapter. (Certainly if manufacturers want to stop making post mount calipers they will need to come up with a solution before all of the mountain bikers descend on them with pitchforks.)

It's not possible to mount flat mount callipers on a post mount as there will be a geometry confliction (you'd have to get rid of the posts to make all the angles correct).

Agreed with having to buy post mount callipers separately too!