I've got a 2016 Stumpjumper FSR Comp. I bought it new in late 2015. I've got about 950 total miles on it sofar. (I keep a spreadsheet of all my rides.)
1. The rebound damping on the rear shock is dead, for the 2nd time. By "dead" I mean zero rebound damping. Suspension bounces like a pogo unless I set the compression damping to "stiff". The first time it broke was at ~650 miles. It broke right at the end of a day of DH at Highland so I decided it was partially my fault (beating on the bike a bit too much). I got the shock repaired in late 2017. It worked fine through last season but then on my first ride this season the rebound damping died again, this time after only ~300 miles. I'm going to ask the company that did the repair if they'll warranty their work, since the shock was supposed to have been fixed, and 300 miles is waaaay too soon for it to die again. I suspect they'll decline but it's worth asking anyway.
But assuming they wont repair it again for free, what do people think I should do with the shock. Pay to fix it again (probably another $150) or buy a new shock? The fact that it died the first time after only 650 miles makes me wonder if it was defective from the start, but there's no way to prove that at this point.
2. Second question. Last fall I had the main drivetrain parts replaced (chainring, cassette and chain but not derailleur) because the gears were badly worn. (Interestingly the shifting was great, but my LBS was convinced things would gt bad really soon. So I replaced the parts...) I had been running a ghetto 1x setup for most of the bike's life, which means I replaced the original front shifting (2x system) parts with a single 28T oval ring but kept the original cassette (SRAM PG 1030 11-36, 10 speed). The new parts are similar but not identical: Shimano SLX HG81 11-36, 10 spd cassette and I went down to a 26T ring on the front because I thought I was over-using the 28,32,36 cogs on the cassette with the 28T. Now with the new parts, the shifting is worse. With the old parts, shifting was always smooth and quiet, even mashing shifts mid-climb. With the new parts, shifting is ok when there's no load but shifts under load are always noisy (crunchy) and often it feels like the cranks will free spin for a quarter to half turn in between gears before catching. Ive taken it back twice for adjustments and the shop claims it's as good as they can get it, but they can't explain why that shifting behavior could occur.
Any ideas here? The Shimano cassette is supposed to be comparable grade to the SRAM 1030 so I dont see how that could be the problem. (Though I am somewhat tempted to slap a new SRAM cassette on there to compare since the chain and front ring are still essentially new.)
But I'm Stumped (sorry!) here. What do ppl think?