CETMA rack users - a weird mechanical problem
04-16-08, 08:18 PM
#1
or tarckeemoon, depending
Thread Starter
Join Date: Dec 2005
Location: the pesto of cities
Posts: 7,017
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
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
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
Team Beer
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,339
Bikes: Too Many
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 114 Post(s)
Liked 159 Times
in
104 Posts
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
or tarckeemoon, depending
Thread Starter
Join Date: Dec 2005
Location: the pesto of cities
Posts: 7,017
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
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
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
Join Date: Jun 2004
Location: Toronto
Posts: 28,353
Bikes: 1987 Bianchi Campione
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Likes: 0
Liked 26 Times
in
19 Posts
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.
