Trimming operation help

22-07.-2003, 03:02 AM	#1
Pakin Junior Member Join Date: Jul 2003 Posts: 4	Trimming operation help Ok, as you can see, I'm new here, as this is my first post Thinking it might be impolite with out introducing myself and to make a biography short, I just started to take interest in road biking. I've been riding bikes since I was 5 and to this date I am 16 and wanted to take cycling to more extensive level. I am mechanically literate in automotive mechanics, which I thought would be no problem towards a bike. I was partially wrong. I bought a Novara Forza from REI last week. Of course it's not the best, but its was to my budget, even though carbon fibre seemed attractive. The Forza has all Shimano SORA components. As I've read reviews, most riders dislike thier operation. Recently I experienced a noise with the chain rubbing on the front der. plate. It happens when the chain is like with the largest rear sproket and the large fron chainring. The shifter on the left has a "trimming" fuction which will slide the plate slightly to the side, so the chain will no longer rub. I tried this, and somehow it's not sticking to the "trim" mode. It ends up clicking twice which goes down to the intermediate chainring on the front. I have no idea how to fix this. Or whether it's a product defect or installation mistake. I don't want to take it to the REI mechanics yet, since that would use up my free one year tune-up. Any suggestions? Thank you in advance. -paK -1 P.S. Pardon the illiterate bike jargon and speeling

22-07.-2003, 03:15 AM

coolworx

Registered User

Join Date: Jun 2003

Location: Springfield MA

Posts: 280

Quote:

Recently I experienced a noise with the chain rubbing on the front der. plate. It happens when the chain is like with the largest rear sproket and the large fron chainring.

The problem isn't your derailleurs - the probem is you are 'cross-chainning' (using largest front/back or smallest front/back), which is a no-no!

If you are in the largest rear sprocket, you should be in the small front chainring.

22-07.-2003, 03:49 AM	#3
Vo2 ArchAngel Join Date: Aug 2001 Location: Orion Nebula Posts: 2,163	coolworx is right. Avoid the following gearing extremes: Attached Thumbnails __________________ Pain is inevitable...suffering is optional

22-07.-2003, 11:13 AM	#4
rek Registered User Join Date: Sep 2002 Location: Melbourne, Australia Posts: 1,200	With regards to the trim function, if you go to the Shimano Europe cycling website, under one of their FAQs, it explains how to adjust it. __________________ Peter Cannondale Synapse Carbon Scalpel Cyclocross Ultra

22-07.-2003, 01:14 PM	#5
Pakin Junior Member Join Date: Jul 2003 Posts: 4	Wow. I never knew that. With the shimano service manual didn't say anything about it. Does cross-chaining wear out the teeth? So should I just use the intermediate front chainring instead if I wanted to use a larger rear sproket? Thanks for the help again, -paK +1

22-07.-2003, 05:44 PM	#6
rek Registered User Join Date: Sep 2002 Location: Melbourne, Australia Posts: 1,200	Cross-chaining does indeed wear out the chain and cogs more than less extreme gears. Also, adjusting the derailleurs in an attempt to remove chain rub in those extreme gears may end up compromising shifting performance in other gears. A lot of gear ratios are duplicated (or near to duplicated) amongst chainrings; i.e. you might find that 3rd gear in on the small chainring might be more or less equal to the biggest gear on the large chainring ... in that case it's nicer on the equipment to run the small ring. __________________ Peter Cannondale Synapse Carbon Scalpel Cyclocross Ultra

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