Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 35 Post(s)
Tagged: 1 Thread(s)
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One more step while you're at it
Originally Posted by hads
Yes, I'm a bit of a novice when it comes to maintaining my own bike, I usually take it to the shop. Thanks for all the advice, I'll try that in the morning it's getting a bit late here in the UK.
If replacing/respacing the cassette was enough to throw the trim off, odds are that the limit screws also need to be re-adjusted. This is another critical step even more important than adjusting the trim because proper limit adjustment is the difference between the chain or RD going into the spokes or not.
Locate the two small screws on your RD which control the extreme limits of travel, often marked "H
" for high gear (outer) limit, and 'L
" for low or inner limit. Adjust the outer "H" limit first by setting the lever in high gear, and using your thumb on the lower pivot to shift to the next cog. While holding it there turn the screw in one full turn, then let go and pedal. The RD should be sluggish to return to high. Repeat and back off the limit by degrees until the shift happens crisply and the RD trims on high gear correctly.
Repeat a similar process for the inner "L
" limit screw. Shift to the second largest sprocket then make the last shift by direct thumb pressure. Tighten the screw until you cannot shift to the largest sprocket that way then back off by degrees until the shift is smooth, and the trim is correct, making sure that you cannot overshift the chain ir RD into the wheel. Now check the adjustment by shifting using the lever.
It's important to test the limits by direct pressure because the click in the lever might act to hide a mis-adjusted limit otherwise, until one day while climbing you overshift past the last click and......(Oops)
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
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