Principia Gear selection Problems

sparky.g said:

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)

Have you tried adjusting the height and rotation of the derailleur in
relation to the chainring? It may have been pushed or knocked at some point.
I can't imagine that a LBS would have missed any other adjustments as front
derailleurs are not *that* difficult to set up. Try taking it to another
shop.

Quoted message said:

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?

Quite. If it really is a dud, then send it back. Not fit for purpose.

"sparky.g" <[email hidden]> wrote in message
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Quoted message said:

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

Quoted message said:

is almost impossible. after much grinding and stopping pedalling it

shifts

Quoted message said:

up eventually. ( I don;t suppose the chain will last long)

It strikes me that this is unlikely to be anything to do with front mech
adjustment, if you and two shops have all failed to get it working better.
TBH, I'm not at all sure, and I'm responding because no one else appears to
have any idea. I used to build Principias, and never experienced this type
of problem. I think my next steps would be:

1/. Check all the cables for smooth operation, and make sure that the lever
isn't right at it's extreme when in the big ring. If it is, and the lever
needs its full range (which it shouldn't, if it's a Dura Ace barcon & front
mech), try clamping the cable on the other side of the clamp bolt.
2/. Check that the chainrings have been correctly fitted (and - you'll
obviously know this straight away - that the sizes are appropriate, and not
39-56, e.g.);
3/. Try a completely different type of chain;
4/. Check that the bottom bracket length is correct - is the mech at or near
it's limit in the big ring?

HTH

"Simon D" <[email hidden]> wrote in message
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Quoted message said:

"sparky.g" <[email hidden]> wrote in message
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Quoted message said:

Does anyone out there have a Principia bike with problems shifting

between

Quoted message said:

Quoted message said:

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

Quoted message said:

is almost impossible. after much grinding and stopping pedalling it

shifts

Quoted message said:

up eventually. ( I don;t suppose the chain will last long)

It strikes me that this is unlikely to be anything to do with front mech
adjustment, if you and two shops have all failed to get it working better.

Well, I watched a bike shop bloke trying for ages to sort out somebody's
front mech when he had these symptoms. It was on wonky, and he didn't
notice. Neither did the owner.

So I'd check that first - is the cage parallel to the chain?

cheers,
clive

Simon D said:

It strikes me that this is unlikely to be anything to do with front
mech adjustment, if you and two shops have all failed to get it
working better.

Never underestimate the cluelessness of some shops. Make sure the the mech
is straight.