CETMA rack users - a weird mechanical problem
04-16-08 | 08:18 PM
#1
Thread Starter
or tarckeemoon, depending
Joined: Dec 2005
Posts: 7,017
Likes: 2
From: the pesto of cities
Bikes: Davidson Impulse, Merckx Titanium AX, Bruce Gordon Rock & Road, Cross Check custom build, On-One Il Pomino, Shawver Cycles cross, Zion 737, Mercian Vincitore, Brompton S1L, Charge Juicer
CETMA rack users - a weird mechanical problem
So the front wheel on my commuter was a little out of true so I took it in the coop and worked on it. I got it about as close to perfect as I could. Since installing my CETMA I noticed that the wheel was a little out because the rack pushes my front fender down a bit so it shifts around and rubs the tire from time to time (I have a solution in mind for that part of the problem already.).
Here's the thing. The wheel is dead true when I'm sitting down and pedaling. Same when I'm standing up and coasting (it's a singlespeed), but any time I'm standing up and pedaling there is a noticeable wobble to the wheel. The tension on the wheel is not the best. It's probably worked its way loose since I last worked on it, but I'm also wondering if the uneven pressure on the bars from standing and pedaling is causing transmitting some lateral flex to the fork.
Anyone?
Here's the thing. The wheel is dead true when I'm sitting down and pedaling. Same when I'm standing up and coasting (it's a singlespeed), but any time I'm standing up and pedaling there is a noticeable wobble to the wheel. The tension on the wheel is not the best. It's probably worked its way loose since I last worked on it, but I'm also wondering if the uneven pressure on the bars from standing and pedaling is causing transmitting some lateral flex to the fork.
Anyone?
04-16-08 | 08:26 PM
#2
Senior Member
Joined: Apr 2004
Posts: 6,357
Likes: 167
From: Sacramento CA
Bikes: Too Many
1. Make sure your cones are adjusted correctly
2. Make sure that the CETMA mount isn't allowing your wheel to slide around
That's all I can think of right now. Good luck.
2. Make sure that the CETMA mount isn't allowing your wheel to slide around
That's all I can think of right now. Good luck.
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
04-16-08 | 08:35 PM
#4
Thread Starter
or tarckeemoon, depending
Joined: Dec 2005
Posts: 7,017
Likes: 2
From: the pesto of cities
Bikes: Davidson Impulse, Merckx Titanium AX, Bruce Gordon Rock & Road, Cross Check custom build, On-One Il Pomino, Shawver Cycles cross, Zion 737, Mercian Vincitore, Brompton S1L, Charge Juicer
Good questions about the bearings. They are Surly sealed hubs. I haven't noticed any play.
04-16-08 | 08:55 PM
#5
cab horn
Joined: Jun 2004
Posts: 28,353
Likes: 30
From: Toronto
Bikes: 1987 Bianchi Campione
Just because it rubs doens't mean it's out of true. No tire is going to sit perfectly, perfect on a rim. Especially cheap tires. If you can flex your wheel while out of the saddle, that means your wheels is dangerously under-tensioned. I suggest you get a tensionmeter and bring it up to spec before you hurt yourself or break a spoke.
