Point well taken.
-
Hey Everyone! May's Bike of the Month challenge is now open for entries!
Chain Adjustment - When and Why
The principal reason why drive chains fail is from excess tension caused by being installed too tight. Since the swingarm pivot is not concentric with the front sprocket, the chain length needs to accommodate the constantly changing distance between the front and rear sprocket as the rear suspension moves up and down. So the dimension on the swingarm sticker is intended to prevent you from installing the chain too tight. Looser is O.K.
You’ll use the sticker tightness measurement when you need to reassemble after changing sprockets or changing a tire on a bike with double-sided swingarms. Bikes with single-sided swingarms have eccentric adjusters, so no adjustment is required when changing a tire.
Once the chain adjusters are locked down there’s no reason to periodically readjust the chain. Chains get longer, not shorter, as they wear.
As the internal pins and bushings in a chain wear, the chain length of the affected segment gets longer, and when it exceeds 2 mm for a 16-link segment, the chain needs to be replaced. Chains don’t wear evenly, but even if they did, the overall increase in length of a chain needing replacement is less than 11 mm. Consequently, you don’t need any periodic adjustments to compensate for this small amount of wear for the life of the chain. You do, of course, need to periodically check 16-link segments of the chain for excessive wear and replace the chain if necessary.
You’ll need do a chain adjustment when the chain has been loosened to change a tire or sprocket. Also, a 3,000 mile or so tire change interval seems like a reasonable time to check for chain stretch. If you bring your bike to a dealer for a tire change, ask them ahead of time to write down the chain stretch amount for at least three segments of chain. This will put them on notice that you expect them to do it. It’s not often a dealer will actually do the check and a snapped chain is the consequence.
You’ll use the sticker tightness measurement when you need to reassemble after changing sprockets or changing a tire on a bike with double-sided swingarms. Bikes with single-sided swingarms have eccentric adjusters, so no adjustment is required when changing a tire.
Once the chain adjusters are locked down there’s no reason to periodically readjust the chain. Chains get longer, not shorter, as they wear.
As the internal pins and bushings in a chain wear, the chain length of the affected segment gets longer, and when it exceeds 2 mm for a 16-link segment, the chain needs to be replaced. Chains don’t wear evenly, but even if they did, the overall increase in length of a chain needing replacement is less than 11 mm. Consequently, you don’t need any periodic adjustments to compensate for this small amount of wear for the life of the chain. You do, of course, need to periodically check 16-link segments of the chain for excessive wear and replace the chain if necessary.
You’ll need do a chain adjustment when the chain has been loosened to change a tire or sprocket. Also, a 3,000 mile or so tire change interval seems like a reasonable time to check for chain stretch. If you bring your bike to a dealer for a tire change, ask them ahead of time to write down the chain stretch amount for at least three segments of chain. This will put them on notice that you expect them to do it. It’s not often a dealer will actually do the check and a snapped chain is the consequence.
1 - 3 of 18 Posts
Yes, the chain pivots about the output shaft (small sprocket) but the swingarm moves about its own pivot point. The chain has the least slack when the output shaft, the swingarm pivot and the rear wheel axle are in a straight line. This occurs when the bike is heavily loaded and when the bike moves in its suspension during cornering.Does the chain get tighter when the swing arm moves?
Sent from Motorcycle.com Free App
Being in excess of the unloaded chain slack spec marked on the swingarm assures that the chain won't bind under all suspension movements and load conditions. You should have more slack — but not less — than the spec dimension.
1 - 3 of 18 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Ducati.ms - The Ultimate Ducati Forum
A forum community dedicated to all Ducati owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, superbike racing, maintenance, and more!
Full Forum Listing
Explore Our Forums
Recommended Communities
