Sorry for a long post from a new guy. I purchased my first mountain bike in March, an 09 Marlin Disc. I rode trails almost daily and around 3 months and 650 miles I started having some shifting issues.
The bike would switch gears on its own, higher or lower mainly under heavy load, while i wasnt trying to switch gears. Then when i did try and switch gears it may jump multiple gears or none. Ive had it in to multiple bike shops. The bike doesnt seem to hold a tune for a week (3 to 5 rides). Each time the store replaces the rear derailleur cable and says that should fix it then says its a new cable it stretched.
Now 4 months/ 800 miles on the bike with 4 rear cables and 2 chains im stumped. Some bike stores say ive worn out the teeth on the rear cassette and chain rings others say they look fine.
Does anyone have any ideas or suggestions? Any feedback would help. Bike was cleaned and the chain lubed (white lightning clean ride) after every other ride. I can post pictures later also.
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