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Principia gear selection problems
All
Does anyone out there have a Principia bike with problems shifting between large and small rings at the Front?? I have a TT2 Light with an Ultegra front mech, and crankset and Dura Ace rear mech and Bar end shifters. Shifting up to the large ring at the front is almost impossible. after much grinding and stopping pedalling it shifts up eventually. ( I don;t suppose the chain will last long) The bike is new, Although purchased before the winter it has been ridden once and not been right ever. I have had the bike looked at by my local bike shop , who couldn't get it working (despite having an experienced mechanic), then by the company I purchased it from (2 hrs drive away from home). they said they found that the gear selection cable had pulled through the sheath (and they replaced the front Mech) and then they sent the bike back, But it is still the same, they did say bar end shifters are not as smooth as STIs. I figured it was a problem with the frame and was about the get them to swap it for a Rexe Pro frame instead (they have bolt on frame lugs where as the T2 is braised on). But!! At a race last night I was speaking to someone who was frustrated and having the same problem with her Principia, Rexe Pro, with Full Dura-ace all round including the STi.s So anyone else have this problem ?? Is it an issue with Principia frame geometry. Note my £600 Giant with Tiagra components shifts sweet every time in any situation (even with about 4000 miles on it), so surely I should expect equal if not better performance from a new £3000 bike? Any suggestions or notes from others with similar problems would help cheers all Andy |
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#2
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Principia gear selection problems
On Thu, 3 Jun 2004 06:37:42 +0100, "sparky.g"
wrote: Does anyone out there have a Principia bike with problems shifting between large and small rings at the Front?? This is a question for rec.bicycles.tech. Advertising is the subject here in rec.bicycles.marketplace. rear mech and Bar end shifters. Shifting up to the large ring at the front is almost impossible. after much grinding and stopping pedalling it shifts up eventually. ( I don;t suppose the chain will last long) I can't imagine how stopping pedalling would help it shift. Keep pedalling. I have had the bike looked at by my local bike shop , who couldn't get it working (despite having an experienced mechanic), then by the company I purchased it from (2 hrs drive away from home). they said they found that the gear selection cable had pulled through the sheath (and they replaced the front Mech) and then they sent the bike back, But it is still the same, Insist that they make it right. It's absolutely ludicrous to buy a brand new bike and it can't shift well under average conditions. You aren't trying to shift into extreme cross-chained positions (such as big-big and small-small), are you? they did say bar end shifters are not as smooth as STIs. I figured it was a This is 100% wrong. Bar-end shifters are optimum for front shifting; STI is great for the rear. The rear is a precision application using capable equipment and under little stress; the front is a caveman-like shove of the tensioned side of the chain, which also wants easy micro-adjustments -- perfect for bar-end (and other friction-type) shifters. Anyway, if they really think it should be so difficult to shift with bar end shifters, they should not sell them. problem with the frame and was about the get them to swap it for a Rexe Pro frame instead (they have bolt on frame lugs where as the T2 is braised on). How could frame joint style affect shifting? But!! At a race last night I was speaking to someone who was frustrated and having the same problem with her Principia, Rexe Pro, with Full Dura-ace all round including the STi.s Sounds like you and her both have incompetent mechanics. So anyone else have this problem ?? Is it an issue with Principia frame geometry. I just looked on the Principia site, and I don't see anything radical about the geometry. Note my £600 Giant with Tiagra components shifts sweet every time in any situation (even with about 4000 miles on it), so surely I should expect equal if not better performance from a new £3000 bike? You absolutely should, and you should expect quicker, easier front shifting with bar end shifters. It's possible that, when they fixed it, it worked for them on a test-ride. However, you should probably go there, insist that they fix it, and test-ride it around there before going home with it. It sure sounds mostly like the H screw on the front derailer needs to be adjusted and/or the cable has too much slack. Assuming it shifts just as badly on a workstand as on the road, try pulling on the cable itself where it's exposed at the downtube while pedalling with your other hand. Just pull the cable away from the downtube. If that works fine, then it's somewhere between your hand and the shifter. If that doesn't help, try adjusting the H screw. Then, pull the cable by hand again; if it works, then try the shifter. Etc. Here's some shot-in-the-dark ideas as to what else could be wrong: - Incompatible parts (off-brand chain or crank?) - Bad chainring - Bad derailer, shifter, or cable - Cable getting stuck somewhere -- Rick Onanian |
#3
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Principia gear selection problems
Sparky.G wrote:
All Does anyone out there have a Principia bike with problems shifting between large and small rings at the Front?? I have a TT2 Light with an Ultegra front mech, and crankset and Dura Ace rear mech and Bar end shifters. Shifting up to the large ring at the front is almost impossible. after much grinding and stopping pedalling it shifts up eventually. ( I don;t suppose the chain will last long) The bike is new, Although purchased before the winter it has been ridden once and not been right ever. I have had the bike looked at by my local bike shop , who couldn't get it working (despite having an experienced mechanic), then by the company I purchased it from (2 hrs drive away from home). they said they found that the gear selection cable had pulled through the sheath (and they replaced the front Mech) and then they sent the bike back, But it is still the same, they did say bar end shifters are not as smooth as STIs. I figured it was a problem with the frame and was about the get them to swap it for a Rexe Pro frame instead (they have bolt on frame lugs where as the T2 is braised on). But!! At a race last night I was speaking to someone who was frustrated and having the same problem with her Principia, Rexe Pro, with Full Dura-ace all round including the STi.s So anyone else have this problem ?? Is it an issue with Principia frame geometry. Note my £600 Giant with Tiagra components shifts sweet every time in any situation (even with about 4000 miles on it), so surely I should expect equal if not better performance from a new £3000 bike? Any suggestions or notes from others with similar problems would help cheers all Andy Dear Sparky hello from Oz downunder we run full durace on the RC principia frames and cannot fault it, on either bike as some one els mentioned get a decent mechanic, the fault is heart breaking but majo dramas are caused by minor faults. I would consider talking to Principi their techs are great, use comms on their site. Also have a talk t shimano quite often their own mechanis are at major meets and I woul assume they do the same in the US. My best advice dont mix systems,i durace, tiagra etc. eveyone I know who runs bitsa sets has suffere dramas at the worst possible time. Warre - |
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