Bike Forums

Bike Forums (https://www.bikeforums.net/forum.php)
-   Bicycle Mechanics (https://www.bikeforums.net/bicycle-mechanics/)
-   -   Why cant I get this Rival FD perfect? (https://www.bikeforums.net/bicycle-mechanics/554212-why-cant-i-get-rival-fd-perfect.html)

milnerpt 06-21-09 08:53 PM

Why cant I get this Rival FD perfect?
 
Been trying to adjust my girlfriends 07 Rival FD for the past month and just cant get it right.

Mongoose Bosberg bike, 09 Rival crankset (compact)

When I adjust the outer throw just so it doesnt rub in the big ring, it wont smoothly shift up from small to big rings.... you have to be at least halfway through the cassette for the front derailleur to even get the chain up on the big ring.

However, if I try to loosen up that outer throw just a little bit, shifting from small to big works fine.... but then it will start throwing the chain right off the big ring.

I thought maybe it was cable tension, but increasing the tension didnt seem to help any with the shifting (from small up to big chainrings).... I didnt change the cables, but they dont seem kinked or gunked up.

Am I just destined to hear her tell me I need to work on it again until I can buy her some duraace? (never a shifting problem)

Severian 06-21-09 09:49 PM

have you checked the alignment of the fd relative to the chainrings? is it toed inboard or outboard at all, is it too high or too low?

those are what I'd check next.

Wordbiker 06-21-09 10:38 PM


Originally Posted by Severian (Post 9142887)
have you checked the alignment of the fd relative to the chainrings? is it toed inboard or outboard at all, is it too high or too low?

those are what I'd check first.

Fixed that for ya.

milnerpt 06-21-09 11:24 PM

Did set the high/low.... so there is about 3mm clearance between the top of the ring and the bottom lip of the derailler. Ill have to double check the toe in/toe out though.

Severian 06-22-09 10:31 PM


Originally Posted by milnerpt (Post 9143218)
Did set the high/low.... so there is about 3mm clearance between the top of the ring and the bottom lip of the derailler. Ill have to double check the toe in/toe out though.

Errm... you should have a MAXIMUM of 2 mm and a minimum of about 0.5mm clearance between the bottom edge of the outer limb on your FD cage and the outer edge of the teeth on your large chainring when your FD is in the innermost position.

Panthers007 06-23-09 08:55 AM

As most professional bike-mechanics will tell you: The simplest and easiest way to adjust the FD is to start over. Reinstall the FD from start to finish. Trying to adjust a FD that's already been in use simply will fix one thing - then create another string of other problems. And this will drive you mad!

So follow the directions exactly from these two links:

http://www.parktool.com/repair/readhowto.asp?id=75

and...

http://bicycletutor.com/adjust-front-derailer/

This should solve the problem.


All times are GMT -6. The time now is 01:27 AM.


Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.