Problem with road bike...not sure of name so bear with me...

Tino4444
Tino4444 Posts: 281
edited July 2009 in Workshop
Hi All,

Last night I was wheeling my bike (spesh allez 09) back to the garage and noticed a slight scraping noise. :?

Now on closer examination (bike upside down with back wheel spinning) there is a plastic disc behind the gears on the back wheel which seems to be rubbing on the largest of the gears.

I thought :idea: at first that there was some dirt between the plastic disc and the large gear so cleaned the bike....noise still there.

Now then this plastic disc appears to be out of true and so have tried bending it straight again but it is still catching.

.......Sorry I hope I am making sense so far.........

My question to you is......what is this plastic disc thing for? can it be removed? or should I be looking to replace it?

I would be thankful of any advice that you can offer.

Cheers,

Tino. :)
Speciallized Allez 09...great bike shame about the wheels!!

Comments

  • just chuck it - on a well set up bike they serve no purpose
    Over 50mph on Malaucene descent
  • Tino4444
    Tino4444 Posts: 281
    just chuck it - on a well set up bike they serve no purpose

    Ah ok, whats its purpose then?

    Tino.
    Speciallized Allez 09...great bike shame about the wheels!!
  • andyp
    andyp Posts: 10,269
    It's there to prevent your rear derailleur from fouling the spokes, but as wreckedmyklein says, on a correctly set up bike it should never be a problem. You can bit it without consequence.
  • Tino4444
    Tino4444 Posts: 281
    andyp wrote:
    It's there to prevent your rear derailleur from fouling the spokes, but as wreckedmyklein says, on a correctly set up bike it should never be a problem. You can bit it without consequence.

    Ah I see....education is a wonderful thing thanks very much for the info I will remove it.

    Tino.
    Speciallized Allez 09...great bike shame about the wheels!!
  • Monty Dog
    Monty Dog Posts: 20,614
    commonly known as a 'dork disc' - might be OK for abused kids bikes but unnecessary on a road bike
    Make mine an Italian, with Campagnolo on the side..
  • keef66
    keef66 Posts: 13,123
    It won't prevent a badly adjusted rear mech going into the spokes, it's there to prevent the chain fouling the spokes and locking the wheel if it overshifts and drops off the largest sprocket.

    I, and many others, think they look hideous, so hack the thing off, but do make sure the rear mech is properly adjusted.
  • Tino4444
    Tino4444 Posts: 281
    keef66 wrote:
    It won't prevent a badly adjusted rear mech going into the spokes, it's there to prevent the chain fouling the spokes and locking the wheel if it overshifts and drops off the largest sprocket.

    I, and many others, think they look hideous, so hack the thing off, but do make sure the rear mech is properly adjusted.

    Its gone....AH and the noise has gone. :D

    Surely this weight loss from the bike will make me at least 4 mins faster on my next ten mile TT :roll:

    Tino
    Speciallized Allez 09...great bike shame about the wheels!!