Bicycle Mechanics - New sora shifter issue
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08-20-11, 06:01 AM
Hi and thanks in advance for any help!
I have just (yesterday) got my first road bike, a new specialized allez sport compact double.
All the components seem to be shimano sora.
I have noticed when shifting the FD down from the big ring to the smaller it is very stiff and makes a loud noise. I have no problems shifting up and when shifting down past that first shift.
I took it back to the bike shop where I got it, and they took a look at it and said it was all ok and would 'loosen up' after some more use.
The problem is I don't believe them, as none of the other bikes I test rode were like that.
I don't think they have put it together correctly, am I right to be this sceptical? Should I go back and ask them to look at it again or wait and see if it loosens?
08-20-11, 07:02 AM
sounds like too much cable tension
08-20-11, 08:26 AM
martyn_ez: You state that you have a compact double, but then mention "shifting down past that first shift." A double only has rings/two one shift, can you clarify?
Having asked that, is the FD cage set too low and striking the large chainring? A new bike, or any bike for that matter, should not make "a loud noise" when shifting. The shop should make this right.
08-20-11, 03:33 PM
Thanks for your help you guys.
After a little research (shimano TSI), I don't think they have been set up properly at all.
The first shift down shifts from the large ring to the small. I can then shift the FD down twice more (without the chain moving). This was I meant by being able to "shifting down past that first shift."
Looking through the help documents, it seems that the larger outer ring has two positions (something about trimming) and the inner one.
I dont think they have set this up correctly. Would you agree?
Odds are that it's OK but you're just not used to a trimable FD. The extra click is a fine tuning or trim click to keep the cage from rubbing the chain as you use the outer chainring with middle and inner cassette sprockets.
Use the small clicks to trim as you ride on different sections of the cassette, and shift to the inner whenever you're ready. I don't know if you have a trim adjustment on the inner, but it doesn't matter because you usually can't use the inner chainring with the outer sprockets since the chain coming from an outside angle may touch the outer ring on it's way to the inner.
Now as to the feel of the clicks. It's possible (but I'm not seeing the bike) that the cable trim is a bit outboard and bringing the cage hard against the limit screw. This means that there will be higher than usual cable tension on that last click out, giving you a bit of a pop when you back off.
This may be intentional, anticipating a bit of cable stretch in the first few weeks, or to give you a more positive upshift.
All in all it seems that the bike is right, or at least very close to right, so you should get out and ride it. Every bike is slightly different, and every mechanic has slightly different touch. The bike will settle in and you'll get used to it, and it'll feel perfectly fine within a few weeks.
08-20-11, 08:02 PM
Try loosening your high limit screw just a touch, 1/8 to 1/4 turn at most. I've seen similar issues that were fixed by this adjustment.
08-21-11, 02:53 PM
Problem sorted, took my bike back to the shop.
Apparently it wasn't shifting properly because the front shifter is one for a triple crank rather than a double (apparently normal for specialized?), which hadn't been set up properly.
All working now, looking forward to getting out on it.
Thanks again for everyone's help
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