Flat mount disc brakes on post mount frame

srchar · 2022-01-17T11:31:25+00:00

In case anyone else has this issue now or in future... I recently bought a used Mason Definition frame from eBay. It was one of the original, post-mount frames, and I wanted to fit Campagnolo H11/Chorus. The calipers are flat-mount only. I considered using one of Shimano's original post-mount road calipers (the frame actually came with one), but didn't want to mix Campag and Shimano bits. I also looked into using a Magura or Hope caliper. Then, I came across this website: https://www.assolutions.ca They sell various adaptors to convert post-mount frames to flat mount. I placed my order and, after two weeks, a nicely-machined part turned up in the post, complete with mounting bolts.

This topic has 14 replies, 10 voices, and was last updated 2 years, 10 months ago by amazon22.

Creator

Topic
January 17, 2022 at 11:31 am #31932

srchar

In case anyone else has this issue now or in future…

I recently bought a used Mason Definition frame from eBay. It was one of the original, post-mount frames, and I wanted to fit Campagnolo H11/Chorus. The calipers are flat-mount only.

I considered using one of Shimano’s original post-mount road calipers (the frame actually came with one), but didn’t want to mix Campag and Shimano bits. I also looked into using a Magura or Hope caliper. Then, I came across this website: https://www.assolutions.ca

They sell various adaptors to convert post-mount frames to flat mount. I placed my order and, after two weeks, a nicely-machined part turned up in the post, complete with mounting bolts.
Creator

Topic

Viewing 14 replies - 1 through 14 (of 14 total)

Sort:

Author

Replies
August 14, 2023 at 6:19 pm #988597
0

amazon22

I have the same v1 Definition

I have the same v1 Definition and have been loking for something like this – which was the actual one you ordered? They have 140 > 160 and 160 > 160. I see Wolftooth now do one as well, but equally unclear ordering criteria.

January 24, 2022 at 2:12 pm #988595
0

hawkinspeter

Has there been some comments

Has there been some comments deleted from here? I recall stating something similar to Dicklexic, but it’s no longer here.

January 24, 2022 at 1:55 pm #988593
0

Dicklexic

I wouldn’t say ‘indefinitely’

I wouldn’t say ‘indefinitely’ but it’s certainly a very long time. Shimano use mineral oil which is not hygroscopic, unlike DOT brake fluid. In fact it is hydrophobic so consequently it does not absorb moisture. DOT fluid is hygroscopic so any contact with open air will lead to moisture being absorbed from the air, and thus cause the brake fluid can boil if it gets hot.

January 20, 2022 at 10:09 pm #988591
0

Captain Badger

mdavidford wrote:
You should drink within at most 2 months of opening.

Ha! be lucky to make it last more than an evening…..

January 20, 2022 at 9:32 pm #988589
0

mdavidford

You should drink within at

You should drink within at most 2 months of opening.

January 20, 2022 at 9:19 pm #988587
0

Welsh boy

Going off topic but how long

Going off topic but how long will an unopened bottle of Shimano mineral oil last? I have a bottle which came with my mtb brakes about 12 years ago which has never been opened, will it still be ok to use in my new road brakes?

January 18, 2022 at 9:17 am #988585
0

hawkinspeter

Thanks – that makes sense.

Thanks – that makes sense.

January 18, 2022 at 9:02 am #988583
0

wycombewheeler

hawkinspeter wrote:
wycombewheeler wrote:
mixing shimano and campagnolo would be bad as I understand they use different brake fluid.

Campag levers would be compatible with sram calipers I believe

As long as the parts aren’t used, would there be any difference in performance if you used different hydraulic fluid? (Not going to do it, but just curious on whether there’s any practical reason that you couldn’t run Campag on Shimano fluid and vice versa)

I think the seal material is specific to the fluid used, calipers and levers intended to work with DOT (SRAM) are not compatible with mineral oil (shimano/campag) and vice versa

January 18, 2022 at 8:59 am #988573
0

wycombewheeler

mixing shimano and campagnolo

~~mixing shimano and campagnolo would be bad as I understand they use different brake fluid.~~

~~Campag levers would be compatible with sram calipers I believ~~e

my mistake, the calipers hope sell for use with shimano are the same as they would sell for campag. Thanks to others below for correcting this.

https://www.hopetech.com/products/brakes/road/rx4-caliper/

That being said both the fluid type and the volume transferred must be the same, so there should be no issues.

January 18, 2022 at 8:08 am #988581
0

Wingguy

wycombewheeler wrote:

wycombewheeler wrote:
Campag levers would be compatible with sram calipers I believe

No, that would be much worse than mixing Shimano and Campagnolo. Sram uses Dot fluid, the other two are both mineral oil.

January 17, 2022 at 10:54 pm #988579
0

Kesa

Cool!

Cool!

I did a bike groupset upgrade a year ago and had the same problem. I ended up using Shimano m6100 mountain bike calipers.

I will keep an eye out for these 🙂

January 17, 2022 at 1:18 pm #988577
0

srchar

Not quite. Shimano & Campag

Not quite. Shimano & Campag both use mineral oil. SRAM uses DOT.

January 17, 2022 at 12:51 pm #988575
0

hawkinspeter

wycombewheeler wrote:
mixing shimano and campagnolo would be bad as I understand they use different brake fluid.

Campag levers would be compatible with sram calipers I believe

As long as the parts aren’t used, would there be any difference in performance if you used different hydraulic fluid? (Not going to do it, but just curious on whether there’s any practical reason that you couldn’t run Campag on Shimano fluid and vice versa)

January 17, 2022 at 11:42 am #988571
0

srchar

Pic

Pic
Author

Replies

Viewing 14 replies - 1 through 14 (of 14 total)

You must be logged in to reply to this topic.