Hi,
So today I ordered some new wheels for my 700c conversion. The wheels come with a 7 speed freewheel which is just what I need. However, my current cassette is 13/23 and the new one is 14/28. What adjustments will I need to make to the rear derailleur so that it will shift smoothly and accurately on the new cassette.
Jamin
Retro Falcoln Majorca
2013 Carrera Vanquish
Hi Dave. Thanks for your reply. It is a freewheel. I thought they were called cassettes as well. Lol
Lower gearing is why I bought the freewheel. The 13/23 that sits on the bike now is paired with a 52/42 double chainring and I find that to be overgeared. I'm hoping that the new freewheel will mean I dont have to get a set of 50/39 or 50/34 chainrings.
It's a Shimano 105 rear derailleur......not sure of the actual model number. There appears to be plenty of screw showing out of the B adjuster. I understand that if I screw that further in then
it will move the derailleur down to accommodate the bigger sprockets. I think I will need a new chain as it's still rocking the chain itnhad when I bought the bike and it's seen 2 winters use since then......in other words it's filthy!!
Retro Falcoln Majorca
2013 Carrera Vanquish
On the inside surface of the cage on the rear derailleur, there should be a model number stamped. You may be able to look up the compatiblity from that. There are two issues, if it can swing down far enough to clear the 28 tooth and if it has the range to handle going from a 42-14 up to a 52-28. Some short cage road deraileurs can't take that wide a range, but you may be fine. Good luck
Just to reinforce one point Dave made:
New Freewheel (or cassette) = New Chain.
Nigel
Yes, ABSOLUTELY necessary when the new freewheel has a larger cog!
I had a look on the rear der this morning. It is a Shimano Rd1055 or 1056. I can't tell as my eyes can't read that small. Had a quick look on velobase and both the Rd1055 and Rd1056 have a max tooth capacity of 28t so it should work but I'm going to go to LBS this afternoon to pick up a new chain.
Gentlemen, thanks you your help and input. Wheels and freewheel should arrive in the next couple of days along with the tires and tubes. Got to wait till next week to receive my long reach calipers
Retro Falcoln Majorca
2013 Carrera Vanquish