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#1
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please explain "trim" feature on front derailer
I keep reading about the "trimming ability" benefit of Tiagra and
above front derailers. Could someone explain to me in detail what this trim ability is, and if it is something that I will be using on my new 2004 Cannondale R600 Triple? |
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#2
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please explain "trim" feature on front derailer
On Tue, 16 Sep 2003 18:49:19 +0000, mark watkins wrote:
I keep reading about the "trimming ability" benefit of Tiagra and above front derailers. Could someone explain to me in detail what this trim ability is, and if it is something that I will be using on my new 2004 Cannondale R600 Triple? In the old days, once we shifted from one sprocket to another, we would slightly move (trim) the front derailleur lever so the cage would not rub on the chain. When Shimano indexed front shifting, you got one position, and if it rubbed on some rear choices, too bad. Campy came out with a not-really-indexed front shifter, that allowed you to move the front cage pretty much like the old days, except that there were clicks involved. Shimano has now improved its front shifters to essentially allow the same thing -- an improvement that went back to the way things were 30 years ago. -- David L. Johnson __o | "What am I on? I'm on my bike, six hours a day, busting my ass. _`\(,_ | What are you on?" --Lance Armstrong (_)/ (_) | |
#3
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please explain "trim" feature on front derailer
I recently bought a new bike with a Shimano Tiagra front derailleur and am
still confused about how the "trim" feature works. Sometimes it appears to be active, other times not. Appears to work only on the large chainring, and not in all gears. Can anyone explain how more precisely this is supposed to work? It is a nice feature. "mark watkins" wrote in message m... I keep reading about the "trimming ability" benefit of Tiagra and above front derailers. Could someone explain to me in detail what this trim ability is, and if it is something that I will be using on my new 2004 Cannondale R600 Triple? |
#4
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please explain "trim" feature on front derailer
I keep reading about the "trimming ability" benefit of Tiagra and
above front derailers. Could someone explain to me in detail what this trim ability is, and if it is something that I will be using on my new 2004 Cannondale R600 Triple? Grrrr. Makes me angry! No, not because you bought the R600 instead of the TREK 1500, but because the dealer didn't go over this with you. Happens once in a while at my own shop as well, despite how often I explain to staff that they have to assume the "trim" function is something the customer may not know about. The "trim" function on nearly all Shimano triple road groups (with the exception of DuraAce and Sora) works the same way. On the smallest and middle front chainring positions, you can move the front shift lever slightly so that it's centered over the chain, eliminating chain rub on the derailleur. This is really something that should be demonstrated to you, in person, and if you come across a staff member who's confused by it, by all means seek out someone else at the shop. Mountain bikes don't have this feature, and somebody who's totally into mtn biking and nothing else may not even be aware it's there. OK, since they didn't explain the "trim" function, here are a few other tidbits to keep in mind- #1: Full rated tire pressure at all times (unless you weigh 120 pounds and ride on roads as smooth as glass). If the tires are rated at 120psi, don't ride them at 105. At full pressure, you'll get fewer flats and a more efficient ride. If you want a smoother ride, switch to the next-wider tire. #2: Make sure you understand how the quick-release wheels work. You probably already know, but in case you don't, quick-releases are cam-operated devices that lock in place by flipping the lever open, *not* by screwing them on. It's the shop's responsibility to make sure the customer knows this; often times they don't, because they think everybody knows this and that they'll make it look like they think the customer's an idiot by showing it. #3: Keep the seat level, not nose-down. If, to get comfortable on the saddle, you require a nose-down position, you need to either switch saddles or look at your fit (quite possibly you're too stretched out, especially if the bike still has the stock stem on it). The problem with riding with the nose down is that you're being shoved towards the bars while riding, and you're actually pushing back with your arms the entire time, trying to maintain position on the seat. This causes pain in the neck & shoulders. I think that's about it for now; get back to us if you've got any more questions. But first get back to the shop (or some knowledgeable friends) for a demonstration, not just an explanation, of how the "trim" function works! --Mike-- Chain Reaction Bicycles http://www.ChainReactionBicycles.com "mark watkins" wrote in message m... I keep reading about the "trimming ability" benefit of Tiagra and above front derailers. Could someone explain to me in detail what this trim ability is, and if it is something that I will be using on my new 2004 Cannondale R600 Triple? |
#5
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please explain "trim" feature on front derailer
"Mike Jacoubowsky" wrote in message ... The "trim" function on nearly all Shimano triple road groups (with the exception of DuraAce and Sora) works the same way. What about on the DuraAce? I have a DA triple fdr and I *think* I have a working trim??? Either that, or something needs adjusting possibly. Why would not there be a trim on DA, but there is on others? Thanks, Mish |
#6
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please explain "trim" feature on front derailer
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#7
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please explain "trim" feature on front derailer
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#8
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please explain "trim" feature on front derailer
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#9
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please explain "trim" feature on front derailer
On Wed, 17 Sep 2003 05:59:07 GMT, Mike Jacoubowsky
wrote: The "trim" function on nearly all Shimano triple road groups (with the On my double 105, too. #2: Make sure you understand how the quick-release wheels work. You Also, note how to operate the QR for the brakes. Nobody showed me when I bought my road bike, and it took me a minute or two to realize it was there when I first struggled with a tire. --Mike-- Chain Reaction Bicycles http://www.ChainReactionBicycles.com -- Rick Onanian |
#10
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please explain "trim" feature on front derailer
"Mike Jacoubowsky" wrote in message ... The "trim" function on nearly all Shimano triple road groups (with the exception of DuraAce and Sora) works the same way. On the smallest and middle front chainring positions, you can move the front shift lever slightly so that it's centered over the chain, eliminating chain rub on the derailleur. This is really something that should be demonstrated to you, in person, and if you come across a staff member who's confused by it, by all means seek out someone else at the shop. Mountain bikes don't have this feature, and somebody who's totally into mtn biking and nothing else may not even be aware it's there. Mountain bikes used to have this feature, with 7sp XT Rapidfire Plus shifters. I was dismayed when it was discontinued with the 8sp drivetrains. But these drivetrains can usually be set up so trimming isn't necessary -- as long as you use all the parts that were designed to work together. Road bikes often have shorter chainstays, which makes this more difficult. Of course, Campy Ergo is infinitely trimmable... Matt O. |
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