Post mount caliper in a flat mount frame - SRAM ETAP

Discuss light weight issues concerning road bikes & parts.
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pmprego
Posts: 216
Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

Hi all,

So I've some post mount calipers for my SRAM ETAP Hrd groupset. I was planning on buying a new frame that is prepared for flat mount calipers.

Is there any adaptors that will work for me and avoid buying 2 new flat mount calipers that will make my current two totally useless?? Thanks a lot!!

Ritxis
Posts: 428
Joined: Fri Jun 01, 2012 3:00 pm
Location: San Sebastian

by Ritxis

pmprego wrote:
Tue Oct 22, 2019 9:57 am
Hi all,

So I've some post mount calipers for my SRAM ETAP Hrd groupset. I was planning on buying a new frame that is prepared for flat mount calipers.

Is there any adaptors that will work for me and avoid buying 2 new flat mount calipers that will make my current two totally useless?? Thanks a lot!!
https://images-na.ssl-images-amazon.com ... SY355_.jpg

https://encrypted-tbn0.gstatic.com/imag ... yWCV_4YtKe

https://encrypted-tbn0.gstatic.com/imag ... 5IYkS6JQVe

Shimano, TRP, XLC.......................

pmprego
Posts: 216
Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

Ritxis wrote:
Tue Oct 22, 2019 10:31 am
pmprego wrote:
Tue Oct 22, 2019 9:57 am
Hi all,

So I've some post mount calipers for my SRAM ETAP Hrd groupset. I was planning on buying a new frame that is prepared for flat mount calipers.

Is there any adaptors that will work for me and avoid buying 2 new flat mount calipers that will make my current two totally useless?? Thanks a lot!!
https://images-na.ssl-images-amazon.com ... SY355_.jpg

https://encrypted-tbn0.gstatic.com/imag ... yWCV_4YtKe

https://encrypted-tbn0.gstatic.com/imag ... 5IYkS6JQVe

Shimano, TRP, XLC.......................
I've seen those online. My question was perhaps not well made. I'm new to this and I've been discovering that nothing seems to be compatible with nothing Which is really annoying.

I've even found some Shimano adaptors but will they work with sram calipers?

It seems that nothing is standardized in this industry!!

NickJHP
Posts: 347
Joined: Wed Feb 14, 2018 2:22 am
Location: Canberra, Australia

by NickJHP

Any brand of adapter for post mount calipers on a flat mount frame should do the job. Just remember that the adapters for front and rear are not the same.

I was in the same boat as you - eTap HRD groupset with post mount calipers and flat mount frame, but what I did was to buy a front/rear pair of Hope RX4 flat mount calipers for SRAM, and I sold the unused SRAM post mount calipers on fleabay for about 60% of the cost of the RX4s, so the expense of swapping the calipers wasn't much. In fact, if I'd decided to use adapters I would have had to purchase some, so the cost difference was really even less.

I always face disc caliper mounts before installing the calipers, as hardly ever have I received a frame that has perfect caliper mount alignment out of the box. If you're going to use the adapters plus the post mount calipers, that job should still be done.

pmprego
Posts: 216
Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

NickJHP wrote:
Tue Oct 22, 2019 11:28 am
Any brand of adapter for post mount calipers on a flat mount frame should do the job. Just remember that the adapters for front and rear are not the same.

I was in the same boat as you - eTap HRD groupset with post mount calipers and flat mount frame, but what I did was to buy a front/rear pair of Hope RX4 flat mount calipers for SRAM, and I sold the unused SRAM post mount calipers on fleabay for about 60% of the cost of the RX4s, so the expense of swapping the calipers wasn't much. In fact, if I'd decided to use adapters I would have had to purchase some, so the cost difference was really even less.

I always face disc caliper mounts before installing the calipers, as hardly ever have I received a frame that has perfect caliper mount alignment out of the box. If you're going to use the adapters plus the post mount calipers, that job should still be done.
The assembly will be made by a lbs. However, so far, all of the bike shops I've visited were unaware of the existence of such adaptors.

In the meantime I've found these: https://www.bike24.com/p2142082.html

I'm wondering if these would do the job. I have even shown this to a local bike shop.

As for what you did, that would be my preferred plan. Buying some new ones and selling these. But where I live there isn't a second hand market for these type of things.

Ritxis
Posts: 428
Joined: Fri Jun 01, 2012 3:00 pm
Location: San Sebastian

by Ritxis

pmprego wrote:
Tue Oct 22, 2019 1:29 pm
NickJHP wrote:
Tue Oct 22, 2019 11:28 am
Any brand of adapter for post mount calipers on a flat mount frame should do the job. Just remember that the adapters for front and rear are not the same.

I was in the same boat as you - eTap HRD groupset with post mount calipers and flat mount frame, but what I did was to buy a front/rear pair of Hope RX4 flat mount calipers for SRAM, and I sold the unused SRAM post mount calipers on fleabay for about 60% of the cost of the RX4s, so the expense of swapping the calipers wasn't much. In fact, if I'd decided to use adapters I would have had to purchase some, so the cost difference was really even less.

I always face disc caliper mounts before installing the calipers, as hardly ever have I received a frame that has perfect caliper mount alignment out of the box. If you're going to use the adapters plus the post mount calipers, that job should still be done.
The assembly will be made by a lbs. However, so far, all of the bike shops I've visited were unaware of the existence of such adaptors.

In the meantime I've found these: https://www.bike24.com/p2142082.html

I'm wondering if these would do the job. I have even shown this to a local bike shop.

As for what you did, that would be my preferred plan. Buying some new ones and selling these. But where I live there isn't a second hand market for these type of things.

It is valid, you only need to buy depending on which diameter of discs you use

Sockman
Posts: 49
Joined: Mon Jun 17, 2019 1:58 pm

by Sockman

If your bike shop doesn't know these mounts exist, I would have second thoughts in having them install your brakes. Call me crazy, but they are a fairly important part to not *f##k* up!

I have a flat mount frame running post mount sram force calipers. It works just fine!

pmprego
Posts: 216
Joined: Mon Jan 21, 2019 3:16 pm

by pmprego

Sockman wrote:
Wed Oct 23, 2019 9:29 pm
If your bike shop doesn't know these mounts exist, I would have second thoughts in having them install your brakes. Call me crazy, but they are a fairly important part to not *f##k* up!

I have a flat mount frame running post mount sram force calipers. It works just fine!
I get your comment but if any of the local bike shops around me had no idea about these what can I do? Becoming a mechanic or moving town is not an option :noidea:

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