|I pedaled the lockring off of my cassette.||Citius|
Apr 4, 2001 3:10 PM
|Today I went out to train in a really big gear. Living in a totally flat environment, I pedaled a 53/11 for five miles. Then I noticed the chain rubbing the front derailler. It got louder and louder, until the cassette seized up and I couldn't pedal at all. I took the rear wheel off and noticed that the cassette lockring was unscrewed. I tightened it and got home in a more reasonable gear.
How did this happen? I know that the lockring was tight because I installed the cassette myself. Was it not tight enough? Was I exerting too high of a lateral force on the cassette and rubbing the lockring against the dropout? The course that I was on has a lot of stop and start areas so I was out of the saddle and standing on the pedals for much of the ride. The bike is a Litespeed Ultimate with full DA. Any Ti flex issues?
|Sounds Strange||grz mnky|
Apr 4, 2001 3:52 PM
|There aren't too many ways that this could happen, but I guess there's at least one ;-) |
Given that the lockring has to rotate in a direction opposite to pedaling the thing that makes the most sense would be for the lock ring to some how drag against a chainstay while you were pedaling. Being in your 11 for a longtime may offer some clues. Time to play Sherlock Holmes...
|Check torque||Kerry Irons|
Apr 4, 2001 4:10 PM
|I don't know the torque spec. for DA cassettes, but it is 50 n-m for a Campy. That is a lot of torque. Absent rubbing of the lock ring on the frame, it's hard to imagine this is anything other than not tightening the lock ring enough.|
Apr 4, 2001 5:02 PM
|Grz mnky is thinking as always and an intriguing thought. Kerry is very scientific with the Newton-Meters spec. I use a 12" Crescent wrench and the Park tool to tighten the Dura-Ace steel lock ring. Turn it till the "gritty" ratcheting sound is gone, then a pretty firm pull. Have changed out a lot of old 7-speed and 8-speed cassette cogs back when you could un-pin them and choose your own cog set build up. Now a days with the Yoke style carrier hardly ever mess with them. Intriguing, very Intriguing, Dr. Watson. |
|At least you could fix the problem, .......||Largo|
Apr 4, 2001 6:50 PM
|One ride on my MTB, i got to the top of a 3 hr climb, and right near the top, i snapped the top two cogs of the rest of the casette. It was an XT, with that light spider. tried riding a bit, and the 2 cogs kept jamming in the spokes and locking up the back wheel.
|Good Story ...||Breck|
Apr 4, 2001 7:39 PM
|Wow!, another one for the book. Originally the cogs were screwed onto the spider and coming loose was not rare. Then Shimano started riveting them on. The down side is you can't replace the individual riveted cogs. Tacoed wheels are easy to fix. You simply take them off and bang them on the ground against the tire in the right spots till they straighten out enuff to ride. Open up the brake canti if you have to. May take some practice, but you can get the kinks out. True 'em when you get home. |