Bicycle Mechanics - Getting 10 speeds from DA-10?
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08-06-05, 09:51 PM
Trying to finish out upgrade to DA-10. Bike was built for 9 speeds, so I assumed the move to 10 would be fairly simple. Swapped out the Ultegra-9 components I had - shifters, rear derailleur, cassette, chain - for DA-10. But am only getting 8 clicks.
I 'nulled out' (right term?) the rear shifter before installing the cable. The derailleur, w/ no cable tension, comes to rest immediately below the 3rd-smallest cog. Installed the cable per instructions (as far as I can tell). Clicks stop-by-stop to the largest cog. But coming back down the cassette, the last click brings to back to only the 3rd smallest cog.
What have I missed in the installation process?
You need to review the derailler install/adjust section at www.parktool.com Look on the left side of the page under Repair button. www.sheldonbrown.com also covers this. If the rest position of the RD is at the 3d cog, ie with no cable tension, then you need to adjust the RD so that its rest position is over the outer most or smallest cog or perhaps a smidgeon (say 0.5mm or so) outward of the smallest cog. The middle of the upper idler wheel on the RD is the reference point for this. There are two adjustment limit screws on the back side of the RD that control how far out and how far in the RD can go. Turning one of these will allow the RD to be positioned over the smallest or outermost cog on the cassette. The other screw prevents the chain from being shifted inwards of the largest cog and hence away from the spokes. Review the web sites for cable tension and tension adjusting. If the shifter is not skipping or hasn't lost a position it should now take the RD from the 11-12t cog all the way to the inmost large cog with successive shifts. You may need to adjust the B screw on the RD also and perhaps chain length if it is new.
08-07-05, 08:54 AM
Your limit screws are not set properly.
Disconnect the cable from the derailleur and let the derailleur move all the way down the stack in rear (turn the crank of course). If the chain is not sitting on the smallest cog in back, adjust the LIMIT SCREW to allow the rear derailleur to drop the chain to the smallest cog. READ THE INSTRUCTIONS that came with your parts to learn where the limit screw is.
After you have the derailleur/chain/rear cog sitting on the smallest cog, now install the cable and pull it tight while tightening the cable clamp screw.
Next, tighten the cable tension to allow the derailleur to shift up the stack cleanly.
Last thing to do is set the cable stop to allow the rear derailleur to move to the largest cog in back.
Hope this helps.
08-07-05, 01:06 PM
Thanks -- the lower limit screw was the problem. Thought I'd done that, but...
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