I just received my new 2007 Cervelo Dual which I got a great deal on in Competitive Cyclist’s closeout sale for 2007 cervelo’s.
However, on putting together the bike I’m finding that the guide pulley is touching the sprockets as it turns when I try and ride it. Trying to adjust the tension screws on the derailleur doesn’t seem to have any effect. Just thought I would consult the Oracle of Slowtwtich for some words of advice before I get someone to look at the bike for me.
Check your chain length. It may be too long.
Shift to the outermost rear sprocket, innermost front and check your chain tension. It shouldn’t sag in the middle (between the crank chainring and rear sprockets) and the pulleys shouldn’t hit the sprockets. If it is you need to take some links out.
What “tension screws” are you referring to? If you adjusted the H/L screws you may have introduced problems in shifting to the outer/inner most gears. If you adjusted the barrel tension knob you may have problems everywhere in between now. No big deal though because if you have to take links out you’ll have to fine tune it all anyway.
Thank you for the replies, I think you are probably right about needing to take some links out.
I played around with the H/L screws a bit, and you are correct Hugh I’m now having trouble shifting to the inner/outermost sprockets. Is there anything disastrous that can happen from playing with these that I should know about before going any further?
If you give the rear der. too much room to move over the biggest cog it can throw the chain off between your cassette and spokes. Not likely, just be careful; I’ve seen it happen and it’s a bitch to get back out.
http://www.parktool.com/repair/readhowto.asp?id=64
It is a good thing to know how to do.
i’ts probably your B-screw on the back of the derailler, if it’s touching the sprockets in on the largest gear than you need to increase your B-screw tension/and or decrease the chain length. That park link is a good one
No, you can’t really tear anything up. Although your first time out it is possible to convince yourself that you’ll never get it working right again.
If you have a trainer or a work stand it’ll make things a easier. Learning the secrets behind tuning your derailers will make you much happier with your bike in the long run as they all need tuning over time. Spending a couple of hours now getting it figured out will save you a LOT of headache and a few $$$ down the road.