Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies
17 posts • Page 1 of 1
Can anyone tell me why my new wheels won't fit on my current bike?
I'm not too fussed, as the wheels are for my new frame, however I was planning on riding the wheels for a while until the frame is ready.
The front wheel is fine.
The rear wheel won't fit in the rear drop-outs. The spacing is fine (130 mm) but the end sections of the hub is slightly too thick to fit inside the drop-outs.
The new wheels have Alchemy hubs. The current wheels have Shimano Ultegra 600 hubs.
Was there a new 'standard' change in rear hub/axle sizing that I wasn't aware of?
Here is a picture of the drop-out.
+1 - file the dropout until the axle slides in there. It won't be much (1mm max) and nobody will know if you do it carefully.
Forks (especially rubbish stamped dropout forks rather than forged dropouts) are the worst for some reason. Good frames seem to fit everything, the worse the frame, the tighter the fit. Not sure how that works exactly.
So we get the leaders we deserve and we elect, we get the companies and the products that we ask for, right? And we have to ask for different things. – Paul Gilding
but really, that's rubbish. We get none of it because the choices are illusory.
I'd file down the axle instead of the frame. You can replace an axle. You can't "unfile" a dropout.
I thought rear axles were a standard size? It sounds odd, anyway.
Drubie, some old racers had smaller front axles. Usually the K-mart specials. And even with those I'd file the axles to fit rather than vice-versa.
I presume that you have confirmed that it is the axle size that is different by measurement. I'd also prefer filing a flat spot on the axle (and always installing the flat uppermost) to filing the dropout. The one I could see in the photo looked pretty parallel anyway.
A slightly left field possibility. Is the smallest cog on your cassette bigger than the previous one? The reason that I ask is that adjustable dropouts had pretty much died out by the 90's which was when cassette hubs and 130mm spacing became common. If it was not designed for cassette hubs it is possible that the smallest cog is interfering with the tail end of the chainstay and just making life awkward. My tandem frame is a 126mm which I spring out to 130mm, but I discovered that I have to have an 11T smallest cog because the 12T interfered too much.
Interesting. The cassette on the new wheel is a 13-26. My current cassette is a 12-25. I'll check to see if that is the issue, because the non-drive side dropout seems to be fine. It's jamming on the drive side.
I took it into Cecil Walker and they suggested that it was most likely a bit of corrosion on the drop out. They suggested a 'very gentle' filing to smooth it over. That drive-side drop out has had a bit of rust on it.
I'll also double-check the hub axle diameters.
Have you checked that the drop-outs are parallel? If the frame has been given a dodgy home re-spacing from 126mm to 130mm, they may not have re-set the drop-outs and this would leave the inner part of the axle slot slightly too narrow, hence preventing you easily slotting the axle in.
Just a thought.
I bought the frame new so I've never changed the spacing myself. The lateral spacing looks fine. It's possible one of the drop-outs may have bent slightly over time.
I suspect the marginal difference in diameter from switching to a 13T outer sprocket is the problem - the teeth are most likely pressing slightly against the seat stay? If so, try the old 12-25 cassette again.
I ride 25s on the basis that they divide more easily into 100 than 23s.
I note comments about small cog size.
Will the wheel fit if no cassette is on the hub?
I use a 10 speed in an older steel frame, and yes, the teeth on the small cog foul the chainstay during wheel fitment. Simple solution is to unscrew the spindle adjustment a cuople of turns, and spread the frame a couple of mm while sliding the wheel in.
Well I got it in. The axle on the new hub (Alchemy) was a fraction thicker than the existing Ultegra hub. By that I mean about 0.1 mm difference. The issue seemed to be caused by some excess anti-rust primer that I've applied over the years, and the softening of the drop-out around the existing axles. This had created an uneven surface at the drop-outs. We (i.e. Dad and I) filed off the excess primer and managed to get a smoother face. We checked the height of the drop-out slot on the inside and outside to check we were filing 'flat' . Seems to be OK now.
Anyone want to talk about open-cam skewers in sloping drop-outs?
Have ridden the new wheels a few times and it has come loose a few times. I think I'll stick with my existing skewer (Shimano 600 Ultegra) for the old frame, and leave the KCNC skewer for the new frame with its vertical dropout.
Good idea. They don't work 100% on longer dropouts. Makers sell them cause they look cool and are a touch lighter.
The open-design skewers on my Miche wheels were passable on long dropouts, but you really had to crank them shut. Same as these:
I now use older Ultegra hubs with these skewers. They're not stupidly tight, and they've never budged:
MY RIDES: My Velospace Profile
What this man said.
Open cam skewers don't clamp or grip as well as old-school steel closed cam units. This is especially noticeable when you use them with forged horizontal/sloping dropouts.
Put the old skewer on rode in this morning with the new wheels. I gave them a real thrashing and the axle didn't budge.
New wheels are nice too. I have lost about half a kilogram of weight for the set, and the rear seems a bit stiffer too when out of the saddle.
17 posts • Page 1 of 1
Who is online
Users browsing this forum: Bing [Bot]