nonamedcyclist

The new hubs spacing seemed to be too small for the fork that it now rubs against the disc brake mount. In the picture, I can't even squeeze it in-between the mounting point and the rotor. Old hubs were 100mm, new one are said to be 100mm, both fit just fine on the fork.

Looking for solutions or workarounds. Steel fork of a 20' (406) minivelo. I actually thought of installing the mount on the other side but the disc caliper would be too far offset and there doesn't seem to be a mounting adaptor for that.

Local bike shop recommended I just get a new fork.

(new user so I cant post images and links directly but here are the photos imgur dot com/a/TSNIv1f)

Polaris OBark

Polaris OBark

Is the rotor by any chance shimmed (the shim(s) would be between the rotor and the hub.

nonamedcyclist

By default no. It's just screwed directly to the hub. (see the photo where the wheel is removed from the fork)

Iride01 

A good fork is going to be expensive. Did the shop make the decision on what wheels you purchased? If so, make them get you a wheel with a hub that fits that fork.

If you were responsible for what wheel was ordered. You had a wheel in it before didn't you? Put them side by side and figure out what is different about the hub. Then if you can't make the new hub have similar position for the rotor. If it can't be done then send them back and just accept any loss on the return or exchange as tuition for your DIY learning.

Take some pic's of the old wheel from the side and looking down the rotor side from a above. Let us know they are in the gallery and someone will find them.

Welcome to BF


Are you certain there isn't a spacer on the other side of the hub that should be on the rotor side outside of the rotor? Or is it missing entirely. Is the OLD actually what it is supposed to be?

Are you certain that wheel isn't 110mm and you need a 100mm OLD hub?

nonamedcyclist

I bought the wheelset myself online. By the way, it's a Litepro Plus Kfun wheelset. 406 32spokes. There should be pictures online of what the wheelset with the litepro hub looks like.



Not that im aware of. I tried tinkering with the hub, Only thing easily removable is the dust covers which I did try to swap from the rotor side to the other.


Im just going by the specified specs on the shop. I'll try to measure them tomorrow though. Also, the fact that both wheelset fit almost the same on the fork convinced me they have the same OLD. (Wouldn't a 10mm difference have a very noticeable gap and a flex on the fork when you lock it?

grumpus

Remove a spacer from the other side of the axle and add it to this side. Re-dish as required.
Or add a spacer to this side of the axle and spring the fork to make it fit. Re-dish as required.
Or re-space the fork, add spacer, re-dish ...
Or make an offset mount for the rotor and hang the rotor off the back of it.
Or make a caliper mount from a piece of steel angle.
Or have someone mill the appropriate amount off the hub's rotor mounting flange.
.

Kontact

The rotor looks upside down. Flip it and see if that helps.

hounslow

Either the fork is wrong or the hub is. If it worked with the previous wheel then the new hub is to blame.As it appears to be a no name internet special that's more likely. Work with the LBS to get a suitable one to fit, it will be more expensive than no name internet crap though.

grumpus

It's just as likely the bike uses a proprietary front hub and the replacement conforms to standard dimensions. I've had no problems with most of the weirdly named stuff I've bought from AliExpress.

bboy314

When you say too small, what do you meet? Width of the hub, diameter of the axle, what exactly? Does the hub seem like a good fit in the fork with the brake removed?

Also, is this a sealed or loose ball bearing hub? If loose ball, it should be possible to slightly respace it to work.

tFUnK

Something is not right if the old setup worked but the new one doesn't. I feel like there's some info missing. Given that the LBS already looked at it and recommended a new fork, I'm not sure strangers on the Internet will be able to offer more useful insight with less information. The rotor does seem to be installed backwards but I'm not sure that is the culprit. I'm curious how the old setup looks compared to the new setup.

Kai Winters

seems the old wheels were meant to be used with disk calipers using the 'old' side mount style and the new wheels are designed and built for the 'newer' 'flat mount' style so it won't work. looks like you are using an adapter to move from side to flat mount...perhaps using side mount calipers will work.

Iride01 

And comparing the two wheel hubs side by side doesn't give you any clue as to what is different?

tFUnK

I don't think that is a thing - wheels aren't dependant on what type of caliper mount is required.

bboy314

This should have no bearing (see what I did there?) on wheel selection.

maddog34

just measured several disc hubs from disc mounting flange face to the locknut... 10-11mm on a front hub, about 15mm on a rear hub.. all hubs were measured with no disc installed.
Discs are about 2mm thick, typically.

start by measuring your new hub from the outside of the axle locknut to the face of the disc mounting surface.
then measure the old hub in the same way.

update: i just measured from disc mount surface on hub to a SR fork's side caliper mount inner surface.. 16mm.
most side mount-to-post mount brackets are around 10mm, with a bit of variance between brands.

Is this fork on a BROMPTON bicycle?
if so.. all bets are off.
i just searched "litepro hubs" and litepro seems to be some sort of Brompton specialty accessory outlet...?
if the bike isn't a Brompton,... good luck... they like to Re-invent things around that place.
"proprietary engineering"...

oldbobcat

First off, the rotor is not installed backwards, and flipping it wouldn't change anything anyway. Those things are supposed to be flat as a 45 rpm vinyl record. You can play both sides.

Second, if the fork isn't damaged then I see no point in replacing it, especially since that might not fix the problem.

Third, it is obvious there's a difference in width along the axle between the outside of the left axle nut and the rotor between these two hubs. There is a standard but I don't know what it is. At this point it probably doesn't matter. If the new wheel slips into the dropouts without squeezing, then you have to figure out how to remove some axle width on the right side and add it to the left side, and then re-dish the wheel. This is usually done by removing washers from one side and putting them on the other, behind the axle nuts. Or using a thinner axle nut on one side and adding spacers to the other. And don't forget to re-dish the wheel.

Or you can just go back to using the old wheel.

nonamedcyclist

Bumping this to ask for another option not yet said, Since this is a steel fork, is it possible to bring this to a machine shop and ask them to move the caliper mount a few millimeters?

bboy314

First I might consider bringing it to another bike shop to visually inspect. Is adjusting the hub spacing an option?

In post #11 I asked some questions, the answers to which might help in coming up with a good solution.

nonamedcyclist

See the photos for reference. It means the spacing of the new hubs made the rotor is a little bit closer to the edge so that it makes disc caliper mount not fit anymore. Both the new and old hubs fit fine on the fork, only a few millimeters of difference is the problem.

Hubs is sealbearing. with dustcaps

grumpus

Here are all the relevant measurements for disc caliper mounts on forks
https://www.peterverdone.com/wp-conte...-Standards.pdf
where you can see that the inner face of your IS caliper mount should be 4 mm outboard of the inner dropout face.
If you measure that and it's correct you should be looking at modifying the hub, not the fork. Or as I suggested above it might be good enough, and certainly easier, to just stick a spacer on the axle, before you resort to cutting and welding your frame into a non-standard configuration.

maddog34

the problem is that hub, nothing else.
gold anodizing can't cover up bad design/machine work.

Ron Damon

FWIW, that's an old wheelset from when Litepro still flew under the Crius banner.