The stupid questions thread.

[Flow-Rider]

Brains Trust.

Never had to deal with this before because every bike has just worked.

Sunrace 12sp cassette, XT chain, XTR derailleur.

Goes into larger cogs no wukkas, refuses point blank to come off 1st gear, but then for the rest of the cassette the cable is too loose and will double shift.

I've had a bit of a play with the B-screw, tweaked the cable tension. That's about it.

It might be worth replacing the cables, sometimes they slightly bind enough to resist the spring on the derailleur.

 

[pink poodle]

Pretty sure you need a new bike @Cardy George

 

[shiny]

Brains Trust.

Never had to deal with this before because every bike has just worked.

Sunrace 12sp cassette, XT chain, XTR derailleur.

Goes into larger cogs no wukkas, refuses point blank to come off 1st gear, but then for the rest of the cassette the cable is too loose and will double shift.

I've had a bit of a play with the B-screw, tweaked the cable tension. That's about it.

Hanger straight? Long or short cage rear mech? Had a 51 before? Old bike I ended up with a goat link to allow the XTR to sit correctly for the big cassette.

 

[The Duckmeister]

Chain on the right way?

 

[Cardy George]

Chain on the right way?

I did check that after the first ride

 

[Cardy George]

Hanger straight? Long or short cage rear mech? Had a 51 before? Old bike I ended up with a goat link to allow the XTR to sit correctly for the big cassette.

Had a 51t XTR on it before, and was shifting fine other than the munted 1st 2nd 3rd cogs. The Sunrace cassette is the only different piece of the puzzle. Could just be the shimano chain doesn't like it.

I'll keep playing with the b-screw and see what happens.

 

[ozzybmx]

The Sunrace cassette is the only different piece of the puzzle.

Different levels of Sunrace cassettes, if its a lower level without the lifter sipes on the big ring, I would be looking at the shifter housing and cable. It would have worked alright with a Shimano but may not be agreeing with the Sunrace.

Its obvious the spring tension is ok on the XTR derailleur as it was working and the XT chain is similar/same shape to the removed XTR chain.

Has to be cable resistance and a stall to move from ring 1.

Fckn 12spd, its the most pernickety drivetrain ever made, from all manufacturers.

 

[Oddjob]

Different levels of Sunrace cassettes, if its a lower level without the lifter sipes on the big ring, I would be looking at the shifter housing and cable. It would have worked alright with a Shimano but may not be agreeing with the Sunrace.

Its obvious the spring tension is ok on the XTR derailleur as it was working and the XT chain is similar/same shape to the removed XTR chain.

Has to be cable resistance and a stall to move from ring 1.

Fckn 12spd, its the most pernickety drivetrain ever made, from all manufacturers.

10 speed master race.

Sent from my 24069PC21G using Tapatalk

 

[ozzybmx]

10 speed master race.

Even 11.

 

[fjohn860]

Brains Trust.

Never had to deal with this before because every bike has just worked.

Sunrace 12sp cassette, XT chain, XTR derailleur.

Goes into larger cogs no wukkas, refuses point blank to come off 1st gear, but then for the rest of the cassette the cable is too loose and will double shift.

I've had a bit of a play with the B-screw, tweaked the cable tension. That's about it.

Did you do this dance and pray to the gods of clean shifting and COTF respectively....