New chain and sprockets for 1970 T350-II?

[sawheelman]

I need to replace the 525 chain and front (14T) and rear (38T) sprockets on my (new to me) 1970 T350-II.

The width of the old chain is 0.740". A new DID non-O/X ring chain is 0.811" wide. The X-ring chain is 0.866". Anyone know how wide a chain I can put on the bike without having interference with cases? Any chain recommendations?

I can't find a 38 tooth rear sprocket listed on the JT website. They have a 41 tooth item which, if I put a 15T in front, will give me almost the same ratio (0.3659) as the stock 14/38 combo (0.3684).

Any thoughts/advice/guidance would be appreciated. Thanks!

Corey in San Antonio

[joethebike]

I used a generic o ring 525 on my T350 and it wore away a bit of alloy webbing near the front sprocket so I put an extra locking washer behind the sprocket to move it out a little.
I know the fix moved the chain a little out of line but after 30 years of use and still with the same chain, I can confidently say it made no difference to chain life and it stopped the casing wear.

[karl pa]

I put an extra locking washer behind the sprocket to move it out a little.

I did the same on my T250
Are the sprocket teeth hooking? I often change the chain and not sprockets, unless the teeth show wear and begin hooking.

[joethebike]

After 20 years using the same chain you can see not many miles are done on the bike so the sprockets are still in good condition with no hooking.

[karl pa]

Sorry for confusion, the question about teeth hooking was for sawheelman

[sawheelman]

The valleys between the teeth look elongated/asymmetrical to me. I've tried to upload a picture but it keeps telling me the file is too large. It's less than 1 Mb. What's the size limit?

[karl pa]

If it is showing wear I would replace them. It does seem 38 tooth sprockets are not easily available, 41 tooth are more available.

[sawheelman]

Just to bring some closure to this thread: I ended up buying a standard (non-sealed) 525 DID chain as well as two new JT Sprockets - front 15T (JTF419.15) and rear 41T (JTR812.41).