Clearance front motor hub and caliper

sutty86

10 mW
Joined
Jan 20, 2018
Messages
25
First major hurdle,
I'm running a DIY setup,
I've bought an 1000w standard front hub,
I wanted to keep my hydraulic brakes but at the minute struggling for clearance,
The wheel turns but won't spin freely,

Could I sand any part of this down,
I don't think caliper adapters are going to cut it has further up the hub there are bolts .

Any suggestions
https://imgur.com/a/xdqXSWU

160mm disc also
And Shimano qhd-4 brakes
 
Sorry to say, you are pretty much screwed. Front hub on alloy forks is tricky anyway, that torque washer will just break your forks.

If you did get it to fit, you might find as I did, that the motor causes the forks to bind a lot, or at least wear out crazy fast. So what I'm saying is even if you replaced the hydros with a thin mechanical caliper, you might not like what happens next to your high dollar fork.

Its a do over with a rear motor I'm afraid. Or, do over with a bike that motor is ideal for, like a beach cruiser. That motor would work fine on cheap steel pogo stick forks though.
 
sutty86 said:
First major hurdle,
I'm running a DIY setup,
I've bought an 1000w standard front hub,
I wanted to keep my hydraulic brakes but at the minute struggling for clearance,
The wheel turns but won't spin freely,

Could I sand any part of this down,
I don't think caliper adapters are going to cut it has further up the hub there are bolts .

Any suggestions
https://imgur.com/a/xdqXSWU

160mm disc also
And Shimano qhd-4 brakes

If you only need a couple of Milimeters, buy one of these;
http://www.ebikes.ca/shop/electric-bicycle-parts/motor-hardware/diskspacer.html
and then file the mounting holes on the brake caliper carrier so it is slotted(use chain saw file) and can be moved to the outside.
There are also disc spacer kits avail. that offer several size shims in a package, but, at the moment, I can't remember who sells them.
 
Already bought the hub,so rear is a no go , I also had a rear hub bike before but it struggled on hills as all the weight was at the back.
How about buying a adapter to increase the disc to 203mm is it called a pm adapter,

Bike was a steal at £40 , and is in generally good condition,
Frame is small but suspension is good and can be locked off.
 
motomech said:
sutty86 said:
First major hurdle,
I'm running a DIY setup,
I've bought an 1000w standard front hub,
I wanted to keep my hydraulic brakes but at the minute struggling for clearance,
The wheel turns but won't spin freely,

Could I sand any part of this down,
I don't think caliper adapters are going to cut it has further up the hub there are bolts .

Any suggestions
https://imgur.com/a/xdqXSWU

160mm disc also
And Shimano qhd-4 brakes

If you only need a couple of Milimeters, buy one of these;
http://www.ebikes.ca/shop/electric-bicycle-parts/motor-hardware/diskspacer.html
and then file the mounting holes on the brake caliper carrier so it is slotted(use chain saw file) and can be moved to the outside.
There are also disc spacer kits avail. that offer several size shims in a package, but, at the moment, I can't remember who sells them.
Sorry I don't understand,
 
This is what is being proposed:


brakeMod.png


You could also get a post-to-IS adapter, swap the caliper, and then add a couple of 6mm washers as spacers to move the caliper outward. Sort of a hack on a hack....
 
Any suggestions on caliper,
I've just ordered a pm to pm adapter and a 203mm disc to see if it clears
 
teklektik said:
This is what is being proposed:


brakeMod.png


You could also get a post-to-IS adapter, swap the caliper, and then add a couple of 6mm washers as spacers to move the caliper outward. Sort of a hack on a hack....
Thank you for the photo,makes things easier to digest.

The photo is actually really poor,
I have a torque arm in the post comes with c washers also.

The actual disc at the minute fits fine but I understand how filing into a slot now so it can be adjusted out,I think this is probably the best route and buy some more spacers.
 
I'd start with a file too. Slowly file the bolt holes a bit until the caliper clears the motor with at least 2mm of extra space.

Once you get it to clear while the axle bolts are torqued down, then figure out the width of spacer for the disc.

Here's a spot for just about any size you'll need. He's an ebiker, however he is out of stock on some sizes but you can always stack them.

https://www.ebay.com/itm/Bike-6-Bol...hash=item3f336ff485:m:mnDQuRDsKB8lWCEX97HmSGw

There's also some standard bicycle ones too

https://www.ebay.com/itm/Syntace-Di...077335&hash=item25ea826c23:g:HPgAAOSwKIdaWNTk

While it's not the best solution, I'm sure there's a tiny bit of meat left on the back side of that caliper too. Even if you just sand off the paint, every millimeter counts.
 
One solution does fit without the need of any mod: Find a Magura Gustav M front brake.

Another solution is to use a large rotor. A 9 inch or 225 mm disc, and the matching caliper mounting bracket, would space most calipers out of motor rubbing range.
 
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