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New chain - it slips, do I need to change back cassette too?

  • 19-08-2006 2:12pm
    #1
    BossArky
    Moderators, Arts Moderators, Recreation & Hobbies Moderators, Sports Moderators Posts: 9,588 Mod ✭✭✭✭


    2 weeks ago I did the London Triathlon. In the last km of the cycle, coming up the ramp into transition my chain snapped as I was changing down, forcing me to run the end bit.

    Anyway, I got a new chain fitted and cycled around last week.... the new chain slips alot on the middle front cog. I ride a rockrider 5.2, 24 speed.

    I have done approx 4000km on this bike in the past 2 years. I read somewhere that top cyclists, i.e. Lance Armstrong, change their chains every 1000km due to wear.

    Do I need to change the back cassette now as well or are the bike shop just winding me up? They tell me that the reason the new chain slips is due to the wear on the back cogs.

    Thanks for any info.


Comments

  • #2
    silverside
    Registered Users, Registered Users 2 Posts: 1,372 ✭✭✭silverside


    they're right

    ideally you should change the chain before it starts to wear too badly. what's happenned is the cassette and chain have worn in synch with each other so now the new chain doesnt fit exactly.

    cassettes arent too expensive and if you got two years solid riding out of one you're doing well.


  • #3
    BossArky
    Moderators, Arts Moderators, Recreation & Hobbies Moderators, Sports Moderators Posts: 9,588 Mod ✭✭✭✭BossArky


    Ok, I went into the bike shop this afternoon (just after my post and without waiting for advice :rolleyes: ) and took the guys recommendation to get a new back cassette. He put it on, I cycled round.... and it was worse! Lots of slip and grinding of cogs.

    I went back into the shop and took a close look at the cogs on the front, 2 on the big cog were more or less half the size of the others, plus all of the cogs had been eaten a way between the shark fins (not too much experience of changing changes / cassettes so didn't look at this before).

    The shop assistant recommend changing the front cogs and putting back on the old ones. The reasoning for this is that he reckons that the old back cassette(approx 4 years old, I bought it with racing slick tyres on the wheels second hand after I had the bike a while) is made of tougher material than the more modern front cogs (only as old as the bike - 2 years).

    This setup now works fine.

    So the moral of the story... if your chain snaps and you have to replace it... first of all check the wear and tear on your back and front cogs before replacing just the chain... like me, you may need a new set of cogs somewhere :o


  • #4
    silverside
    Registered Users, Registered Users 2 Posts: 1,372 ✭✭✭silverside


    hmmm

    didn't think of that... glad your bike is working now.


  • #5
    BossArky
    Moderators, Arts Moderators, Recreation & Hobbies Moderators, Sports Moderators Posts: 9,588 Mod ✭✭✭✭BossArky


    thanks anyway


  • #6
    Civilian_Target
    Registered Users, Registered Users 2 Posts: 5,618 ✭✭✭Civilian_Target


    Hmm - I'm getting some very occasional chain slippage on my bike too. Since I have continuous chain drive (no deraileur), I'll have to take a look.

    I've done about 2000km on this chain and the bike was 2 years old when I bought it - but I had it in for a service a couple of weeks back and they didn't recommend changing them either.


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  • #7
    milod
    Closed Accounts Posts: 757 ✭✭✭milod


    Civilian_Target wrote:
    Hmm - I'm getting some very occasional chain slippage on my bike too. Since I have continuous chain drive (no deraileur), I'll have to take a look.

    I've done about 2000km on this chain and the bike was 2 years old when I bought it - but I had it in for a service a couple of weeks back and they didn't recommend changing them either.

    Depending on the mileage you've done, that slippage could also be the ratchet mechanism inside your freehub (i.e. the mechanism that allows the cassette to freewheel while the sprockets aren't turning).

    I recently spent a lot of cash changing a chain, cables, and then the back sprockets, only to find that it was the ratchet mechanism. When this is worn, you get slippage under load, most often when starting off. It feels like chain slippage in that the pedals might go one quarter to one half a revolution, so it's easy to miss.

    I'd say on a direct drive, you're more likely to get this problem due to the increased torque you're putting through the hub on hills, or starting off...


  • #8
    BossArky
    Moderators, Arts Moderators, Recreation & Hobbies Moderators, Sports Moderators Posts: 9,588 Mod ✭✭✭✭BossArky


    Civilian_Target wrote:
    but I had it in for a service a couple of weeks back and they didn't recommend changing them either.

    I had my bike in for a service before each triathlon, one in May, one a few weekends ago... and they didn't even look at the chain or cogs.... hence the fact that it snapped and the whole problem arose :mad:

    It probably depends on the shop / assistant doing the service... but I reckon usually all they do is check the gears, brakes, a bit of grease on chain and away you go.


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