142 to 135 conversion problem

Caspian · Nov 8, 2016

Well hi all we have an XT rear hub 142 x 12.............

nad i want to use it on a XTC SLR frame..............

So we have to convert it to 135 x 10........

And like always as we live in iran i dont have the convertors and have to machine them myself.........

The question is...... with those convertors the lenth is going to be reduced to 135 ............that means a 7 mm reduction 3.5 mm for each side.............

Then..........what happens to the disc rotor ???

it moves 3.5 mm southward in comparison to the frame ???

mention the frames disc mount is a post one that we cant adjust the caliper horizontally ........

whats the point ???

are the discances ot the rotor surface in a 135 and a 142 one from the frame seating equal ??? or not ????

Or how about the post mounts on the frames ???

Is the post mount in a 142 frame 3.5 mm inner / nearer to the center / ??? and the one on a 135 frame 3.5 mm further away to that covers this issue

or no ??? should i machine a 3.5 mm spacer to put beneath the rotor in order to cover this 3.5 mm movement ???

Or after this conversion the distance between the frame mount and the rotor surface remains the same ???

I would be very thank full if anybody could help me with this issue..................

Black Squirrel · Nov 8, 2016

All you need to do is remove the 3.5mm from each side of the axle. The brake and freehub locations are the same as 135mm.

Caspian · Nov 8, 2016

Well today i measured them both...........

the 142 holds the rotor exactly 3.5 mm s further away from the frame.........

that means in a 142 mm frame the disc mount must be 3.5 mm closer to the center.........

i dont have a 142 mm frame handy but tomorrow il go for a look and measure in a friends frame .............

Joules · Nov 8, 2016

142mm dropouts have 3.5mm deep pockets to help align the thru axle when installing - it doesn't hold the rotor farther away at all.

That is the point, 135mm dropouts are flush/flat on the inside. 142 has pockets. If you just cut off 3.5mm on both sides of the axle, the disk will land in the correct place; you still have to worry about how to attach it to the frame since, if I'm reading correctly, your frame has open dropouts

Caspian · Nov 9, 2016

http://forums.mtbr.com/brake-time/142-135-conversion-problem-1027495.html

Hoooowa.....got it..............Tahnx a lot............

That is the point, 135mm dropouts are flush/flat on the inside. 142 has pockets.

in this case the XTC SLR dropout have Small pockets too........

ou still have to worry about how to attach it to the frame since,

I have figured that out previously..........

These are the original outer nuts or spacers what ever you call them........

that thread on to the main axle............

and thee are some 20 mm thru axle to qr converters i had made previously......

ill machine a prt that its inner part looks just as the same as the original nuts but 3.5 mms shorter in length ..............and the outer parts just like those converters .........

a part that is a combination of both..........

so i dont roun the original nuts so if my costumer want to use those wheels on a 142 frame he can use them ..........

Aglo · Nov 9, 2016

They are called "end caps".
If you are converting them to 10x135mm, I'm guessing the frame use a 10mm thru axle, right?
You also said the frame has the pockets for the hub.
So, I think that you just need to make two caps exactly like the ones you have for 12x142mm, but shorter by 3.5mm on the side that contact with the frame, and with a bore of 10mm.

In the picture bellow the cap in the left is for a 9x135mm hub, the right one is a cap for a 12x142mm hub, and the one at the center is a cap for a 10x135mm hub.
Take notice that the difference between the 12x142mm and the 10x135mm is that the 10x135 is shorter by 3.5mm, and the bore of the cap is smaller by 2mm.

*end caps for DT hubs.

Caspian · Nov 10, 2016

Tanx Aglo.............

in Fact the thing i need is the 9 x 135 one ...................

But the Xt axle is threaded on the outer bore thus the end cap need threads too.................

and i have to machine them up for my self............

Aglo · Nov 10, 2016

Quick question, I know you live in Iran, but can't you order them online?
You can get it for about 30€, shipping included.

Caspian · Apr 13, 2021

Today i was doing the same thing on a Sram X0

and was wondering it idid so............would i need to re align the face that the rotor sits as well or not.................i was not sure

So i searched the net a little bit.................and came to my own thread..........seems that i didnt remember the things i learned half a decade ago...........

142 to 135 conversion problem

Caspian

Black Squirrel

Caspian

Attachments

Joules

Caspian

Aglo

Caspian

Aglo

Caspian

Top Contributors this Month

Recommended Communities