Jumping chain on new bike

Cornish Trekker
Cornish Trekker Posts: 79
edited February 2008 in MTB workshop & tech
i've recently bought a brand new Marin Eldridge Grade with 9 speed drivetrain. I am experiencing pretty bad 'jumping' on the rear cassette in the middle gears, by jumping i mean that when on shifting down under load the chain just spins, as do the cranks until the chain bites. I am very proficient at setting up gears, have done with 8 speeds for ages without a problem. I would expect this to happen to a worn drivetrain, but on a new ride? My new bikes in the past never did this, is this a problem with new 9 speed systems? Do they need to bed in? HELP PLEASE!!!! thanks

Comments

  • nicklouse
    nicklouse Posts: 50,673
    could be a stiff link but i would take it back to the shop for sorting.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • ginge7289
    ginge7289 Posts: 31
    that sounds strange.

    how long is recent?
    roughly how many miles have you done?
    has it always done it?
  • Cornish Trekker
    Cornish Trekker Posts: 79
    like last week. i've done 2 rides, the first was only 6 miles and it was awful the second was 17 miles and it wasn't so bad although still slipping.
  • endurojcb
    endurojcb Posts: 170
    I'd get it back to the shop for them to sort it out. It's a brand new bike, so it should be their problem to fix!
    2007 Merlin Malt 4

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