We Bought A New Burley Tandem 3 Years Ago . We Rode About 6000 Km And The Cassette On The Second And Third Gears Started To Skip . So I Replace The Cassette , Middle Chain Ring , Lower And Upper Jockey Pulley , And The Chain . My Question Is If I Kept An Eye On The Chain Measure It Once In Awhile Make Sure It Didn't Stretch Too Much Would I Have To Replace The Cassette This Early ? How Long Would A Cassette And The Middle Chain Ring Last As Km Or Miles ? :)
It certainly shows your favorite cogs on that cassette!
Depending on quality and care of drivetrain components 6,000KM ('bout 3,700 miles) is on the low side for wear/longevity.
We use FSA chainrings (54-42-30), Shimano XT cassette (11-34T) and SRAM (PC-991) 9 speed cassette.
combo on our Zona tandem
Our chainrings have 16,000 miles on them as does the XTR rear der. About ready to replace cassette/chain that have 6,000+ miles on them. We certainly are a bit on the high side for mileage/usage of these components. However, we are sticklers on keeping all things clean/lubed (we use hot wax method on chains) and live in a rather dry desert climate near Tucson, AZ.
A clean/lubed/well-maintained drivetrain will last longer.
Just our experience/observation.
Pedal on TWOgether!
Rudy and Kay/zonatandem
Correction to above posting:
Should read: SRAM (PC-991) 9-speed 'CHAIN' (instead of 'cassette').
Next time, better proofread my reply before posting . . . sorry 'bout that!
Rudy and Kay/zonatandem
Chains don't 'stretch', they wear, the rollers and roller housings wear, lose metal and
the chain gets longer because the housing is larger and rollers are smaller. Cleaning
and lube are a significant factor in reducing wear, though no one has proved any
particular method of lubing superior. Tandem torque being higher than single bike
torque, the chains and rings have shorter life spans. My experience on singles is
two chains per cassette, three chains per chainwheel, usually the 42t on a triple.
On the single the 30t CW gets maybe 5-10mi/yr of use out of 2000 or so miles.
On the tandem it will be a lot more but still likely not more than 3-6% of miles.
So the 30t will last years. Jockey wheels last a lot longer than that IME, unless
the axle or the plastic are clearly worn doesn't seem necessary to replace them.
How much does your team weigh? Do you spin or stomp? What is your terrain? Do you shift underload? Do you cross-chain regularly?
If you are a sub-275 lb team, who rides on flat terrain, properly shifts (ease up when shifting / avoid cross-chaining), spins and maintains the chain, then 6k is low.
If you are a plus-400 lb team, you shift under full load regularly, cross-chain, you stomp while riding, are in a wet, mountainous environment and don't maintain the chain, then 6k is not be too bad.
My tandem has several of the 2nd issues (big team, mountainous environment - small chainring gets used for >10% of every ride & my stoker likes 75 rpm better than 95) so my chainlife isn't what it should be.
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