ThisJauntyGent

I've spent about half an hour trying to get the hub adjustment on an old Shimano Exage Sport hub correct, but there's this particular sort of play that never seems to go away. I've adjusted to the point that there is zero play along the axle's axis (Labeled A in the attached pic). However, the axle moves a tiny bit in the "B" direction when I pull from the rim. No amount of tinkering has solved the problem. Could it be a bent axle, maybe?

PS: I love Paint.

ThisJauntyGent

Bumping in the name of justice

DannoXYZ 

bent axle doesn't cause play in the hub. How are you checking for play at the rim? Do you have the hub fully tightened in the drop-outs?

DArthurBrown

Could be a bent axle, but you should be able to see the bend as you turn the axle if that is the case.

My first thought was that perhaps you have one or two bearings, or one or two bearing positions in the races, that have worn unevenly.

Is the play only on one side? If it is you can try swapping the right bearings with the left, the right cone with the left, etc., and see if that helps.

DArthurBrown

Good point, a bent axle wouldn't cause play like that. I've had bent axles cause an uneven binding sensation though.

flanso 

Very well put!

ThisJauntyGent

The bearings are all brand new. I suppose I'll just be living with it then.

Besides, I've discovered an even bigger problem: My rim has a flat spot that can't be fixed through spoke tension =(

Panthers007

Many rims do. Check the sides of the rim for a seam. I'll bet you the flat-spot is directly along the seam in the rim.

ThisJauntyGent

That was my first thought as well, but this particular flat spot is not at the rim. There's a bit of damage to the finish on the rim, so it looks like it must have been bashed or dropped at some point.

This brings up another question though: If most bikes have a flat spot at the seam, does this mean it shouldn't be too much to worry about? I would guesstimate that the dip accounts for about 1.5-2 mm of movement in the rim.

Panthers007

Your 'guesstimate' is on the mark - I measure them when I encounter such. I usually find 'em on mass-produced wheels. This is very common on wheels for 3-speeds. They're wide. They're cheap. They're likely to arrive way out of true & round. And they've been spinning down the roads like this for many decades.

If this was on a high-quality racing or touring rim - then I'd be up in arms. With 3-speed rims they are rather expected. True 'em. Tension 'em. Ride. With the wheel above - I'd need more history of the actual source and application before getting ticked-off and returning same. I'd also want a go with my Park TS-2 and my trusty set of spoke-wrenches.

It's a tough call.

ThisJauntyGent

Everything I know:
Wolber GTA Alloy 700x25c rims on a 1989 Fuji Club. The wheels don't seem like junk, they're laced to Shimano Exage Sport hubs...

Panthers007

And they have an un-fixable flat? I'd get a new wheel. Those rims/wheels are designed to go at pretty good speeds. A 2mm dip/rise would not be even slightly advisable to attempt on such. That's MY opinion.

Anyone else?

jland

I had a Shimano hub where the steel cup came loose in the aluminum hub body. No matter how tight the bearings were, I could always move the rim back and forth with the wheel mounted in the forks. Sounds like you may have the same problem...