Removing outer and inner chainring

JamesBrckmn
JamesBrckmn Posts: 1,360
edited February 2010 in MTB workshop & tech
I want to go for single ring upfront, or maybe just double, but the bolts holding the outer chainring won't undo with an allen key, so what should I use to remove them? They are hexagonal, but are too shallow to undo with an allen key, so what shall i use? Also, if i go with a single ring, rather than double, can the middle ring be held onto the crank on it's own or does it need the inner ring? The cranks are suntour xcm.
Thanks

Comments

  • nicklouse
    nicklouse Posts: 50,673
    what is the cranks set.

    make model and year of good clear pictures.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bails87
    bails87 Posts: 12,998
    You might need 2 allen keys, one in the front and one from the back of the chainset. It's likely that as you're turning the allen bolt, the other allen bolt it screws onto is just spinning round with it, so you need to hold one still and unscrew the other. If that makes sense.
    MTB/CX

    "As I said last time, it won't happen again."
  • Chunkers1980
    Chunkers1980 Posts: 8,035
    bails87 wrote:
    You might need 2 allen keys, one in the front and one from the back of the chainset. It's likely that as you're turning the allen bolt, the other allen bolt it screws onto is just spinning round with it, so you need to hold one still and unscrew the other. If that makes sense.

    2 allen keys... ummm

    More like an allen key, or as it sounds (like M770 XT chainset) a torx poss T25 bolt. Another allen is not too helpful, you'll need a peg spanner/chain ring bolt spanner to hold the back.
  • bails87
    bails87 Posts: 12,998
    My Truvativ Stylo uses allen/hex heads on both sides. They might be different sizes, I can't remember, but it's definitely allen keys.
    MTB/CX

    "As I said last time, it won't happen again."
  • ilovedirt
    ilovedirt Posts: 5,798
    they may be rivetted on if it's a cheapo chainset.
    Also, it may be a torx head, and you may need a flat bladed screwdriver or a chainring bolt tool for the back (not surprisingly, the park tools chainring bolt tool i have doesn't really work a whole lot better than a screwdriver.)
    Production Privee Shan

    B'Twin Triban 5
  • Northwind
    Northwind Posts: 14,675
    I think Shimano use a T30 torq rather than a T25, just to be ****ing awkward as far as I can tell.
    Uncompromising extremist

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