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Chain ring installation(4 posts)

Chain ring installationNewDayNewWay
Dec 8, 2002 11:48 AM
I've been intrigued by the ability to change out chain rings on my Ultegra (did not have this ability on my low-end mountain bike). So while I was cleaning my drive train, I thought I would have some fun and take off the large chain ring. So I did that, but then putting it on posed a few problems. First off, there are the hex screws on the front and the screws that go in the back. The screws that go in the back have slots, so it looks like you would use a screw driver to hold the piece in back in a fixed position while using a hex wrench to tighten the screw. However, even my largest screw driver does not fit this, so I used a quarter. Is there a special tool for this, or do I just need a much bigger screw driver?

Secondly, I didn't know the torque specification, so I looked up the torque specification in my Zinn mountain bike book (should be the same I presume) and the torque is given as 44 inch pounds for an aluminum bolt, however, I have them tighted to about 10-15 foot pounds (120-180 inch pounds), but the bolts seem much loser than before (it took a fair amount of force to loosen them). As you might infer, my torque wrench is in foot pounds, so my measurement may be inaccurate, but I know the screws were much tighter than I have them. Is this torque specification correct? Is there a resource on the web that gives torque specifications?
re: Chain ring installationRusty Coggs
Dec 8, 2002 12:33 PM
Yep, special tool.Check Are you sure they are aluminum.I just tighten them tight with a hex wrench .Always seemed good enuf.No issues.
re: Chain ring installationtrout_bum
Dec 8, 2002 1:56 PM
there is a tool and the torque should be rightbenja15
Dec 8, 2002 5:14 PM
there is a special tool, however a big skrewdriver will work just as well

also the torque you used is probably correct although i didnt double check it sounds about right. The skrews may have been harder to loosen because locktight is used on the threads to prevent them from comming loose