Rear derailleur not changing into large cogs

XtotheZ

Setting up the new rear derailleur and I cant figure out why it wont go up into the larger cogs, It goes as far as 6th highest but no further. Ive been playing with the higher and lower limits and tension but can get it past that cog.
Any help or advice is greatly appeiated as I cant find anything online
Thanks

denbatt

XtotheZ wrote: »

Setting up the new rear derailleur and I cant figure out why it wont go up into the larger cogs, It goes as far as 6th highest but no further. Ive been playing with the higher and lower limits and tension but can get it past that cog.
Any help or advice is greatly appeiated as I cant find anything online
Thanks

Cable may need to be tightened?

Scrappy600

If its a new derailleur, any change you've added more gears and not changed the shifter? if the same number of gears, is the cable jammed, is the shifter jammed/buggered?

krissovo

Short derailler and big gears?

NeedMoreGears

Sounds like either

(i) cable is not tight enough - . Use the shifter to get into the biggest cog it will go to. Put the bike on a stand and pull the cable away from the frame with a gloved hand. If it moves to the bigger gears, then your cable tension is too low.

(ii) lower limit is set too high - same as above but if the shifter does not move to a bigger gear, then the limit screw needs to be adjusted.

or;

the new derailleur is for a smaller number of gears than you have. Seems unlikely unless its a five speed sized derailleur and a ten speed cassette. As Scrappy mentioned does the shifter match the number of gears installed?

Lastly

Disconnect the cable and see can the derailleur be moved by hand to the lowest gear position. It won't want to stay there due to the spring but you should at least be able to crudely check it has enough travel to reach the biggest gear. Is it possible the chain is too short and the derailluer is getting caught in the cassette?

XtotheZ

after alot more fiddling with the tension and screws i got it sorted, thanks