chain and casette

b16 b3n
b16 b3n Posts: 301
edited January 2011 in Workshop
just a quick one. I have a 8psd shimano sora/tiagra setup. i just replaced the casette and chain with a HG70 chain. its slipping under tension, fair enough, chain rings maybe worn. But then i noticed when to look at chain rings, its says 10speed, then i noticed the rear mech should 9speed as its the 4500 tiagra, but ive got a 8speed block? The old chain is a hg73 and ive bought a hg70 regarding its a 8speed bike.

Have i bought the wrong chain?

Many thanks



  • whyamihere
    whyamihere Posts: 7,708
    That's not a problem, they have the same internal width. The problem is that the cassette's too worn for the new chain, and needs replacing.
  • b16 b3n
    b16 b3n Posts: 301
    i just replaced the casette and chain , golden rule of thumb. Must be chain rings then. Brilliant
  • darren H
    darren H Posts: 122
    When you say slipping , slipping how ?.

    Your chainring must be very worn if it's that bad
    ADIHEAD Posts: 575
    But the HG70 is an 8sp chain, not 10sp? Chainrings must be very worn indeed hey? Does it jump on both front rings? Take it all indexed correctly?
  • b16 b3n
    b16 b3n Posts: 301
    all indexed correctly, my theory is that its going to be the rear jockey wheels, as it does not slip, it jumps under high gearing tension