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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 [89 posts] 7 months 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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Canyon48 [1032 posts] 7 months 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 [570 posts] 7 months 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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Canyon48 [1032 posts] 7 months 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!

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srchar [925 posts] 2 months ago
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I wouldn't worry about it.  You can use Shimano's post-mount MTB calipers with road levers.  I'll be upgrading Mrs Srchar's steed (which has post mounts) from Tiagra 4700 mechanical calipers to Deore M6000 hydraulic calipers operated by RS405 shifters next week.

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MonkeyPuzzle [44 posts] 2 months ago
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srchar wrote:

I wouldn't worry about it.  You can use Shimano's post-mount MTB calipers with road levers.  I'll be upgrading Mrs Srchar's steed (which has post mounts) from Tiagra 4700 mechanical calipers to Deore M6000 hydraulic calipers operated by RS405 shifters next week.

I'd like to upgrade from mech disks to hydraulic via the same route, but is it just me or are the hydraulic sti levers a rip off?

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wycombewheeler [1340 posts] 2 months ago
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Hope sell post mount calipers compatible with Shimano hydraulic sti levers. They work well and look great.

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srchar [925 posts] 2 months ago
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MonkeyPuzzle wrote:

I'd like to upgrade from mech disks to hydraulic via the same route, but is it just me or are the hydraulic sti levers a rip off?

The cheapest I can find them is £220 a pair, so yes, they are bit of a rip-off.  Selling the mechanical bits will offset some of the cost though.