hmm. didn’t find anything with pictures and only really old posts. I think it only works with older style bearing cup holders (not the CNC milled like the new aluminum frames). Looks like people have used coke cans, rubber or aluminum shims. I honestly can’t remeber which I used as I did it about 6 years ago and haven’t had the wheel off now in at least 3… I’m thinking I probably used rubber strips, but maybe aluminum.
I have used little strips of rubber (like what you use when mounting cycle computers or lights) as shims between the bearing and holders.
In my case I needed to increase the tyre clearance on the frame by a few mill but I think rubber would make a fairly good packing material. It should distribute the load, is deformable so it isn’t too hard to squeeze into a hole and won’t be nearly as messy as epoxy. You may need to cut and trim to get exactly what you want but I reckon it is worth trying.
Remember you don’t want to overtighten your bearing holders as that will destroy your bearings eventually.
I have used little strips of rubber (like what you use when mounting cycle computers or lights) as shims between the bearing and holders.
In my case I needed to increase the tyre clearance on the frame by a few mill but I think rubber would make a fairly good packing material. It should distribute the load, is deformable so it isn’t too hard to squeeze into a hole and won’t be nearly as messy as epoxy. You may need to cut and trim to get exactly what you want but I reckon it is worth trying.
…
Yesterday I put a Gazz 3X26 on a sun doublewide rim onto a Yuni 26” frame. It fits! Well almost there was zero clearance so I took the bearing shims that came with the KH cranks that I recently purchased, now there is about 2mm clearance on the top and maybe 5mm on sides. MauMau took it on our afternoon ride down a steep slippery slopply muddy trail and it did fine. It measures just a little under 28” and looks like a front motorcycle tire. If I put together another one of these I would go with the Yuni 28” frame to get a little more top clearance.
http://www.unicyclist.com/forums/showpost.php?p=139628&postcount=1
Dont grind anything on the frame!!!
If you have a Taiwanese KH24 frame then you’ll need to shim up the bearing holders to fit the Profile bearings. Read the link that Tom Blackwood provided for more details. Also, contact unicycle.com to find out if they have any custom shims for the bearing holders. If they don’t have shims you can use a soda can to make a shim.
Unless you are talking about grinding the flying saucer shaped spacer that Profile supplies. That spacer can get in the way and grinding it down would improve clearance. I actually don’t use the flying saucer spacer and instead use extra aluminum Profile washers instead.
Re: KH24 tiawan+ profile wheelset
Dont grind anything on the frame!!!
There is no need to grind anything to be able to fit a Profile hub in the frame.
If you have a Taiwanese KH24 frame then you’ll need to shim up the bearing holders to fit the Profile bearings. Read the link that Tom Blackwood provided for more details. Also, contact unicycle.com to find out if they have any custom shims for the bearing holders. If they don’t have shims you can use a soda can to make a shim.
Unless you …
I did this with my LX26 and use it for light muni. The frame will hold a 2.4" tire width, but it doesn’t have adequate height clearance for a large volume MTB tires (Continental Trail King, for example), so I had to use c-shaped shims between frame and bearings. Home Depot sells thin aluminium stock which works nicely – easy to cut, sand, and bend.
And if you are handy you can also install a cheap sidepull brake, which works fine.
I did this with my LX26 and use it for light muni. The frame will hold a 2.4" tire width, but it doesn’t have adequate height clearance for a large volume MTB tires (Continental Trail King, for example), so I had to use c-shaped shims between frame and bearings. Home Depot sells thin aluminium stock which works nicely – easy to cut, sand, and bend.
And if you are handy you can also install a cheap sidepull brake, which works fine.
Hi Aarons. You might be able to but it would take a few shims. The tire comes in contact before the bearings touch the frame and if you tightened the bearing holders the tire would be pushed down by 1-2mm. So even if you shimmed the frame up by 5mm you would only have 2-3mm clearance. I don’t know how much shimming people have done successfully in the past?.
This is just my experience though. You may get lucky and end up with a tire that does not stand so high with a different rim combo etc.
Hi Aarons. You might be able to but it would take a few shims. The tire comes in contact before the bearings touch the frame and if you tightened the bearing holders the tire would be pushed down by 1-2mm. So even if you shimmed the frame up by 5mm you would only have 2-3mm clearance. I don’t know how much shimming people have done successfully in the past?.
This is just my experience though. You may get lucky and end up with a tire that does not stand so high with a different rim combo et…
Maybe somene else can provide more info?