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Newbie Question - Cervelo P3 Gear Shifting
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I just got a 2011 Cervelo P3 (Ultegra model) and am having gear shifting problems.

The problem typically happens when shifting from the small ring to the large ring. The chain seems to jam up against the front derailleur, thus locking the crank. At this point , I have no option but to dismount and untangle it.

My LBS assures me the bike is in perfect working order. If so, then I guess Iím doing something stupid. Iím familiar with the ďbest practiceĒ of shifting when the chain is in the middle of the cassette but it doesnít seem to help.

FYI that this is my first tri bike, but I've down 1000s of miles on my road bike (Trek Madone 5.2) which has exactly the same Ultegra chainset and Iíve never had any problems with it, itís been bulletproof.

The main difference is the friction shifter on the P3 which does take some getting used to.

Can anyone advise what Iím doing wrong, because this is very frustrating. I cannot even begin to consider using this for a race until I know this problem is behind me.

Thanks.
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Re: Newbie Question - Cervelo P3 Gear Shifting [smallard] [ In reply to ]
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the front derailleur is not adjusted properly

find a new LBS or learn to adjust the front derailleur by yourself. Park Tools has a website with instructions.

Shifting should be no different than any other bike. Also some small possibility that chainrings are installed backwards or something.



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Re: Newbie Question - Cervelo P3 Gear Shifting [smallard] [ In reply to ]
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smallard wrote:
I just got a 2011 Cervelo P3 (Ultegra model) and am having gear shifting problems.

The problem typically happens when shifting from the small ring to the large ring. The chain seems to jam up against the front derailleur, thus locking the crank. At this point , I have no option but to dismount and untangle it.

My LBS assures me the bike is in perfect working order. If so, then I guess Iím doing something stupid. Iím familiar with the ďbest practiceĒ of shifting when the chain is in the middle of the cassette but it doesnít seem to help.

FYI that this is my first tri bike, but I've down 1000s of miles on my road bike (Trek Madone 5.2) which has exactly the same Ultegra chainset and Iíve never had any problems with it, itís been bulletproof.

The main difference is the friction shifter on the P3 which does take some getting used to.

Can anyone advise what Iím doing wrong, because this is very frustrating. I cannot even begin to consider using this for a race until I know this problem is behind me.

Thanks.

Had the same issue w the same bike. I was riding a Felt road bike w Dura Ace before.

Try not exerting much force as your changing gears. I found that w my road bike I would 'smash' through the gears. With my Ultegra P3 I 'ease' into the big ring.
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Re: Newbie Question - Cervelo P3 Gear Shifting [jackmott] [ In reply to ]
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Yeah Jack's correct. The P3 has pretty short chainstays which make the shifting on the front a bit finicky. But not so much that jamming should occur. That said FD can be very touchy. i've made tiny height and rotational differences on my TT bike and its amazing how much difference an almost imperceptable change can make.

Styrrell
Last edited by: styrrell: Jun 22, 12 20:04
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Re: Newbie Question - Cervelo P3 Gear Shifting [styrrell] [ In reply to ]
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I had the same problem with a similar bike, '08 P2C. Wound up having to do the same thing- ease into the shift. Also had to make certain I wasn't in an extreme gear (high or low) when moving from small to big chain ring.
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