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SkiingInABlueDream

couple maintenance questions for the gearheads

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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?

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16 hours ago, SkiingInABlueDream said:

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.

Hindsight is 20/20, but did you see if it could be replaced under warranty the first time it failed? I broke the shaft of my Rock Shox Kage two years after I bought my DH bike, and SRAM replaced it with an upgraded one for no charge. Simply riding at a park shouldn't matter. I've ridden my trail bike at Highland, Burke, Killington, and Sunapee (due to the broken Rock Shox) and never had any issues with the Fox shock on it. I'm not a small guy (i.e. I'm fat) or the smoothest rider either.

Having said that, I would say buy a new shock if the company won't repair it for free or at least at a reduced price. You can get a pretty nice Fox Float Factory on Jenson USA for less than $400.

16 hours ago, SkiingInABlueDream said:

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?

What derailleur is this? Looking at the specs of that bike, it seems that it came with either a SRAM X9 or Shimano XT depending on the spec. If it's SRAM, they are notoriously noisy compared to Shimano. I've had SRAM derailleurs on my DH bike (Original X9, upgraded to GX DH 7 speed), and while reliable, they are definitely not as smooth or quiet as the SLX and XT set ups I've had on my trail bikes. The other thing you mentioned is it's a ghetto 1x. It could be because the chain ring and cassette aren't aligned properly. You could try playing around with some crank spacers to align it better.

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I don't have any better advice than what you got above (or what you've already said).  But I do have a lightly used rear shock.   Fox Float EVOL RE:AKTIV.    2016 or 2017 I think.   $125 (or make me an offer or trade).   Can't promise it fits your Stumpy, you'd have to look into that. 

 

 

fox.jpg

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