TY250A Rims

[QABB]

Can anyone tell me what the difference is between an A model set of rims and a later twinshock TY?

Wondering if the following rims could be used with 'A' hubs?

http://www.ebay.com.au/itm/YAMAHA-TY250 ... a94&_uhb=1

[David Lahey]

All the Ty twinshock bikes had the same hubs so any rim from any model will fit A model hubs.
The rear rim on the A model is a fair bit wider than the other TY250 twinshock models (and is a different profile) so the bike will look a bit different if you use a CDE model rear rim. I can do photos if you want

[QABB]

Hi David, great info thanks!

If you have pics that would be interesting....

[David Lahey]

Photos labelled

[QABB]

David is the wider rear rim of the A model the reason why they run a dished sprocket? If the all run the same hub, doesn't this effect chain / sprocket alignment?

[David Lahey]

No, all the Ty250 twinshock models came with the same dished rear sprocket. The sprocket is dished because the rear hub they used for the TY 250 and TY175 did not match the offset of the gearbox output sprocket on the TY250. It does however match the offset of the gearbox sprocket for the Ty175, which is why the Ty175 came out with a flat sprocket

[QABB]

Thanks for the info!

So, my A had a flat sprocket on it. Never noticed (only had the bike a few days before it was dismantled for restoration) but im guessing front and rear sprocket alignment would have been out.

[David Lahey]

A flat sprocket may still have correct chain alignment, if a spacer is used between the hub and the sprocket
Another way I have seen a flat sprocket used on a TY250, was both arms of the swingarm were bent to the left. While this did fix the chain alignment problem, it meant the the rear hub was no longer in the middle of the frame. To get the tyre to be in the centre of the frame, the owner had adjusted the spokes to offset the rim.

[Rod]

Another way I have seen a flat sprocket used on a TY250, was both arms of the swingarm were bent to the left. While this did fix the chain alignment problem, it meant the the rear hub was no longer in the middle of the frame. To get the tyre to be in the centre of the frame, the owner had adjusted the spokes to offset the rim.

Are you serious David,that's just plain 'bizarre'.

[David Lahey]

Another way I have seen a flat sprocket used on a TY250, was both arms of the swingarm were bent to the left. While this did fix the chain alignment problem, it meant the the rear hub was no longer in the middle of the frame. To get the tyre to be in the centre of the frame, the owner had adjusted the spokes to offset the rim.

Are you serious David,that's just plain 'bizarre'.

Yes I'm serious and yes it is bizarre, and it's not the worst thing I've seen by far to have been inflicted on TY250s. I am only guessing the sequence of events in that case. Maybe it's less bizarre if someone got the bike as a basket case with no rear wheel and the swingarm sides already bent from a crash. Who knows?