Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
13/23 to 14/28 rear derailleur question

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.

Retro Falcoln Majorca
2013 Carrera Vanquish
Probably not much, but it depends.
First, you will have to adjust limit screws and cable tension even though they're both 7 speed.
You might need to lengthen your chain so it can handle the 28. Unless the one you have now is pretty new, usually a good idea to change chain at the same time as the cassette anyway.
You need to check if your rear derailleur can handle a 28 tooth. You can try looking up the make/model specs and see what it's rated for. Or you can just put the wheel on the bike and see what happens. But some very short cage road derailleurs won't work well on a 28.

Just a side note that if you're putting smaller wheels (27 --> 700) and larger rear gears on the back, you're going to have noticeably lower gear range than you did before.

Finally, make sure if you have a 7 speed "freewheel" or "cassette". The difference is important and you will want to know what you have.
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 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.
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 Sad
Retro Falcoln Majorca
2013 Carrera Vanquish

Possibly Related Threads...
Thread Author Replies Views Last Post
  Help.. Rear derailleur wrong position? Quixoticish 0 3,087 06-06-2018, 06:56 PM
Last Post: Quixoticish
  SRAM rear derailleur arm length jacke 0 3,965 06-28-2017, 04:52 AM
Last Post: jacke
  Road Bike Rear Derailleur Problem Lighttower 5 5,317 05-19-2017, 01:01 AM
Last Post: painkiller
  Rear derailleur rolling chain off It's your boy 0 5,136 06-05-2016, 04:36 PM
Last Post: It's your boy
  What would you use to replace a Suntour alpha 3000 rear derailleur? eab 5 6,849 08-09-2015, 04:33 PM
Last Post: nfmisso
  Replacing old rear derailleur eab 3 11,147 05-14-2015, 09:55 PM
Last Post: DaveM
  What if your new rear Dérailleur nordog 3 4,915 05-08-2015, 12:30 AM
Last Post: nfmisso
  Rear Derailleur Suicide Into Spokes. fribbles 5 7,568 04-25-2015, 05:22 AM
Last Post: nfmisso
  what Rear Derailleur hanger do i need pastaman06 0 5,496 04-24-2015, 08:36 AM
Last Post: pastaman06
  Rear Derailleur.. I have no idea what I'm doing jjc5 4 6,394 04-13-2015, 03:38 PM
Last Post: elmore leonard

Forum Jump:

ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon