Derailleur adjustment on new bike

Cable stretch has less to do with miles than how many times you yank on the cable.
Also, with more cogs on the cassette adjustments are more finicky.
Just stick it in friction mode and wait longer between tightenings of the cable.:rolleyes:

“…still be getting way out of adjustment every 5-10 miles or so“

Something’s off. Even normal cable stretch leads to very gradual miss-shifting over the first 200+ miles. However, what might have occurred is that the housing ferrules weren’t seated correctly, so you can get a LOT of change in the effective length of the cable from those getting set into place. But over 175 miles, even that should’ve worked itself out quite rapidly.

I’d take it in. Something is slipping. (You didn’t provide details on the drivetrain: what kind of shifters? etc?)

Definitely take it in. Hopefully it’s just something minor, since it’s a new bike. Maybe the screws are a little loose in the derailleur? That’s my guess.

@jrenaut 41463 wrote:

It’s a 10 speed rear, so tons of cogs. What is “friction mode”?

Friction shifting involves changing gears by moving the shifter (just a lever) which will pull the derailleur left/right to another gear. The lever moves smoothly and does not “click” into place. You can feel (and hear) the “friction” when the chain is not directly on a cog and then you just need to adjust the lever until it feels (and sounds) smoother.

The type of shifting most people are used to is index shifting where the derailleur moves a set distance every time you “click” the shifter into a new gear.

Here’s an analogy to help (this is how I understand it) – Friction shifting : index shifting :: manual drive (cars) : automatic drive (cars)

Sources:
http://sheldonbrown.com/gloss_e-f.html (scroll down to Friction Shifting)
http://en.wikipedia.org/wiki/Shifter_(bicycle_part)#Friction_shifting

His bike is 2013 Tiagra, so no friction shifting.

Sorry, I thought :rolleyes: is the international smiley of sarcasm. :rolleyes:!

Is it just me, or do new chains also sort of have a break in period? For example, even on my very well-worn bikes, often when I have a new chain installed, the shifting goes a little whack after 50 or 100 miles, then after some twiddles, seems to stabilize after 200 miles or so.

PS. Jon, aren’t you due for your warranty tune anyhow, or did you already do that? The shop is open late tonight (until 9pm) for potluck if you want to ride out there with me (and maybe take Metro home?) — Ben and Anthony and Johnny are there tonight and can probably do at least some adjustments on the spot. You’d have to put on your cross tires… -Jeff

While they’re working on it, have them check that the cable housing is okay and that the derailleur isn’t messed up. Sometimes those things happen together. They can all contribute to a shifting problem.