Author Topic: Rear Sprocket Replacement - Alternatives?  (Read 407 times)

gavfistow

  • Newbie
  • *
  • Posts: 5
    • View Profile
Rear Sprocket Replacement - Alternatives?
« on: April 14, 2021, 09:09:36 AM »
I've been a member on here (gtd2000) previously after buying a Sym Symba for my GF, about 6 years ago in Florida but couldn't get logged in again for reasons unknown, and could never get the password reset email.
Here's a very old thread!
https://symforum.com/index.php?topic=11905.0

Anyhoo, I'm currently building a scrambler project over here in Scotland and one item I've noticed needs replacing, is the rear sprocket. I did get a new sprocket with the parts bike but it's possibly from a CG125 or similar bike and does not fit on the SYM hub.

Looking at the cost of Sym Wolf Classic 125 sprockets, over here in the UK, they seem to be pretty rare and I could buy a complete CG125 chain & sprocket kit for less than the price of the dedicated Sym Wolf Classic sprocket on its own!  :o

Does anybody know if the rear sprocket from any other models, fits the Wolf Classic?

I've just built a new front wheel for the bike, using a 2.50x17" rim, monkey bike iridescent  twisted spokes and a chunky King's Tire branded tire/tyre.

https://i.imgur.com/EMpU1rT.jpg

 
https://i.imgur.com/3atIjjS.jpg
 
https://i.imgur.com/3vXYh0K.jpg
 
https://i.imgur.com/OPHeGnX.jpg
« Last Edit: May 14, 2021, 06:05:33 PM by gavfistow »

Papa Bear

  • Hero Member
  • *****
  • Posts: 878
  • Near the Motor City
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #1 on: April 15, 2021, 04:58:47 PM »
If you need a new sprocket then you need a new chain as well.
A worn chain wears the sprocket .... and vice versa.
You would be best replacing both sprockets and chain.
Good luck !
Get your motor runnin' .. get out on the highway.

Check out http://www.hogsforhospice.com/

gavfistow

  • Newbie
  • *
  • Posts: 5
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #2 on: April 16, 2021, 05:47:46 PM »
If you need a new sprocket then you need a new chain as well.
A worn chain wears the sprocket .... and vice versa.
You would be best replacing both sprockets and chain.
Good luck !

Generally speaking, if all the components were fitted at the same time, I'd agree the wear would likely be uniform.

In my situation it's an older wheel that's been fitted with a fairly worn rear sprocket, front sprocket looks OK and the chain is in good condition.

I was given a new sprocket with the bike which I think fits a CG125 but I'm looking for a possibility that there's a cheaper sprocket that can be fitted from a different model/marque with the same bolt PCD which I can use - I consider US$40~80 (prices range I'm seeing online for SYM wolf specific parts) pretty steep for a small capacity machine's rear sprocket.

I'm going to be re-building the rear wheel with an alloy rim so I might just use a Honda CB100N hub and fit this chain and sprocket kit, which is cheaper than the rear sprocket (by almost 50%!) for the SYM.

https://www.ebay.co.uk/itm/143298711842?_trksid=p2047675.m570.l5999&_trkparms=gh1g%3DI143298711842.N36.S1.typeWATCH_ITEM_ENDING_SOON.R1.TR3
« Last Edit: April 16, 2021, 06:07:29 PM by gavfistow »

Papa Bear

  • Hero Member
  • *****
  • Posts: 878
  • Near the Motor City
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #3 on: April 17, 2021, 07:41:58 AM »
http://www.scooterseals.com/sym-wolf-parts--2.html

What gear ratio are you planning on running?

I am running a rear sprocket from Scooterseals and have 45,000Km on it with the original chain.
Get your motor runnin' .. get out on the highway.

Check out http://www.hogsforhospice.com/

gavfistow

  • Newbie
  • *
  • Posts: 5
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #4 on: April 17, 2021, 04:46:14 PM »
I've not really put much thought into the gear ratio but would probably just go for the standard sizes?

That's a pretty good mileage out of an original chain and sprocket kit!

I'm still in two minds about which hub to use really. I'd prefer the SYM unit because it's larger and has "as new" shoes fitted. On the other hand, the CB100N hub will possibly give better spares availability and much cheaper parts.

gavfistow

  • Newbie
  • *
  • Posts: 5
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #5 on: May 06, 2021, 06:06:19 AM »
Well, I decided to use the CB100N rear hub which will allow me to use the much cheaper Honda replacement parts.

I still need to true up the assembled wheel and then fit it.

https://i.imgur.com/xVXLkcm.jpg

Next question is where to source a sprocket cover and whether or not something from another bike might fit?

« Last Edit: May 14, 2021, 06:03:52 PM by gavfistow »

Syd

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 516
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #6 on: May 07, 2021, 11:22:17 PM »
Please resize you photos, they're waaaay too big!

gavfistow

  • Newbie
  • *
  • Posts: 5
    • View Profile
Re: Rear Sprocket Replacement - Alternatives?
« Reply #7 on: May 14, 2021, 06:00:48 PM »
Please resize you photos, they're waaaay too big!

I'm not sure why this is happening, pics display fine elsewhere but I agree they are huge on this forum using the IMG brackets!

If you right click and choose, display image in another tab, it displays properly using the same hyperlink?

I've taken out the image brackets and that helps somewhat.
« Last Edit: May 14, 2021, 06:06:35 PM by gavfistow »

An Error Has Occurred!

Call to undefined function split()