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what type of disc braking mount i will need?

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what type of disc braking mount i will need?

Old 10-04-15, 07:39 PM
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Sparda
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what type of disc braking mount i will need?

Hello,

i have a problem with the new bike fork.. i also spoke with an expert mechanic regarding the fork and what type of disc brake mounting i will need to get so i can still use my current brake system. I did a lot of thinking on what type of mounting i should be getting, but i did get few disc brake mounting that may works with my new fork and the current brake system i am using.
so lets make it short. this is the bike fork i got:

http://www.amazon.com/gp/product/B00...ilpage_o00_s00

you should able to see the disc brake mount on the fork's arm from these picture. so the disc rotor i am using is a 203mm. let me know if you need a picture of my brake with the old bike fork to help me out. if you have any question, please ask.
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Old 10-04-15, 09:15 PM
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A pic of your old brake setup would be easier. But thoes new forks have the standard post mount. Almost all disk brakes come with that kind of mount but with a post mount adapter bolted on. All you have to do is remove the post mount adapter and install the caliper on to the posts on the new forks. If you look at this attached pic i supplied all you should need to do is remove the part i circled red.

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Old 10-04-15, 09:55 PM
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unterhausen
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not sure if you can still get an adapter. I'm pretty sure you have an ISO brake and all forks nowadays are post mount. At one time, you could get an adapter if you were willing to go to a bigger rotor
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Old 10-04-15, 10:38 PM
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cobba
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Originally Posted by Sparda View Post
this is the bike fork i got:

Amazon.com : 2015 SR Suntour XCR MTB Bike Fork (26", 1 1/8", Diameter 32, Travel 100mm, Disc Brake, Manual Lockout, QR 9mm, Black) : Sports & Outdoors

you should able to see the disc brake mount on the fork's arm from these picture. so the disc rotor i am using is a 203mm.
Do you know that the fork manufacturer recommends a maximum rotor size of 180mm.

http://www.srsuntour-cycling.com/bik...O-26-4872.html


let me know if you need a picture of my brake with the old bike fork to help me out.
A photo of the brake or the brand and model could be useful.
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Old 10-05-15, 04:26 AM
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dsaul
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To run a 203mm rotor on that fork, you need a post to post 203mm adapter like this one http://www.amazon.com/Hayes-Front-Ad...nt+203+adapter
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Old 10-05-15, 02:42 PM
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Sparda
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ok. for the person who asked for a photo... so here's the more information and photo:

Fork: Rockshox Pike 327 (for mountain bike)
brake system: no model or brand (sorry)

The photo:
Attached Images
File Type: jpg
001.jpg (85.9 KB, 23 views)
File Type: jpg
002.jpg (88.5 KB, 23 views)
File Type: jpg
003.jpg (92.8 KB, 23 views)
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Old 10-05-15, 02:49 PM
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Wilfred Laurier
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As mentioned above, the new fork has a max rotor size recommended of 180mm... this might be because their lawyers don't want people overloading the 9mm QR dropouts, or it might mean that a larger rotor will physically contact the leg of the fork.
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Old 10-05-15, 02:51 PM
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picture # 2 .. ISO mount to post mount which is on the caliper is the thing in the circle ,
if you get a post mount fork you don't need it .

there are different spacers to move the caliper far enough out to fit a bigger than 160 disc..

but the way the lower fork casting is made has to have the disc clearance designed in .. it may not.
As mentioned above ... 180 ..

I have one that will only clear a 160 disc .. they only shaped the inside leg clearance that far up.

Last edited by fietsbob; 10-05-15 at 03:00 PM.
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Old 10-05-15, 03:54 PM
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A 203mm rotor is definitely overkill on any bike that would use a 100mm travel fork. I run a 180mm rotor on the front of my bike and I have never felt the need for more braking power, even on fast downhills.

You could easily switch to a 180mm rotor by using a 160 to 180 post to post adapter instead of a 160 to 203 adapter. The brake doesn't care what size rotor you use. You just need the right adapter to put the caliper in the proper position over the rotor.
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Old 10-05-15, 04:28 PM
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Sparda
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Originally Posted by Wilfred Laurier View Post
As mentioned above, the new fork has a max rotor size recommended of 180mm... this might be because their lawyers don't want people overloading the 9mm QR dropouts, or it might mean that a larger rotor will physically contact the leg of the fork.
Originally Posted by fietsbob View Post
picture # 2 .. ISO mount to post mount which is on the caliper is the thing in the circle ,
if you get a post mount fork you don't need it .

there are different spacers to move the caliper far enough out to fit a bigger than 160 disc..

but the way the lower fork casting is made has to have the disc clearance designed in .. it may not.
As mentioned above ... 180 ..

I have one that will only clear a 160 disc .. they only shaped the inside leg clearance that far up.
Originally Posted by dsaul View Post
A 203mm rotor is definitely overkill on any bike that would use a 100mm travel fork. I run a 180mm rotor on the front of my bike and I have never felt the need for more braking power, even on fast downhills.

You could easily switch to a 180mm rotor by using a 160 to 180 post to post adapter instead of a 160 to 203 adapter. The brake doesn't care what size rotor you use. You just need the right adapter to put the caliper in the proper position over the rotor.
Ah. i understand now why the fork has a max of rotor size up to 180mm. look like i will have to buy 2 new rotors.
and what type of mounting do i need to buy if i am getting 160mm rotor or for 180mm rotor? can you look up in amazon website and find that mounting and show it to me. there are many types/shapes of mounting, so its quite tricky to get the right one.

EDIT: i took another look at my bike.. to see if both rear and front are same.. but i'm surprised to find that the rear is a 180mm and the front which you already know is 203mm. so i would like to hear your opinion. do i need to buy just one rotor for the front.. or should i buy two rotor for both rear and front? and also please show me the mounting from amazon website that i need to make it work with the front.

Last edited by Sparda; 10-05-15 at 04:35 PM. Reason: more information.
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Old 10-05-15, 04:30 PM
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how about doing business with a bike shop rather than the warhouse of amazon?

T hen they will get you the right parts.. I wont get paid by amazon to do your shopping for you.
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Old 10-05-15, 05:59 PM
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you need to get a post mount adapter for the size rotor you get. A bike shop will almost surely have a stack of them on hand, which would probably offset the slightly higher cost of the rotor assuming you buy it from them.
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Old 10-12-15, 10:47 AM
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Sparda
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thank you for all of your answers to my question.. so this topic will be officially:




CLOSED
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