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Chain, Cassette and Crankset Replacement

Hi All

I wanted to get some advice on replacing the above on my 2017 Canyon Ultimate with Shimano 105 5800. The bike has a 52/36 Crankset and a 11-32 Cassette.

I've done 6,500 miles on the bike since new, over 3 chains. The cassette and crankset are still original. I have always tried to replace the chain between 0.75 and 1% wear.

Today I noticed that the chain is between 0.75 and 1% worn again so I have ordered a new chain and cassette given the cassette has now outlasted 3 chains.

I am unsure however as to whether it makes sense for me to replace the crankset at the same time (appears to be a more sensible option economically than just replacing the rings). If I did replace the crankset I would probably "upgrade" to the newer R7000 part (which I assume is backwards compatible?)

Let me know your thoughts - if it is worth doing I am happy to do it, but if it is too early to change I am happy to hold on too

Posts

  • oxomanoxoman Posts: 8,376
    I'm currently running a triple 105 5800 with 10k plus.on the crank set.and.it's.still going strong. I wouldn't bother replacing it unless it's showing signs of wear on the teeth. I agree with changing the cassette every 3 chains or so, that's what I tend to do with mine. Not sure the newer cranksets are an upgrade as they tend to make things lighter and potentially wear out quicker. I would check the state of your jockey wheels though on rear mech as they tend to get forgotten, easy replacement though.
    Too many bikes according to Mrs O.
  • I've taken a picture as I am not 100% sure how to gauge wear (apologies for the state of the bike!)

    Rear mech was changed around 15 months ago I also stripped it down recently to clean and re-grease the jockey wheels as they were squeaking and they look OK


  • oxomanoxoman Posts: 8,376
    If badly worn the teeth will start to look like shark fins and you may find you get chain slip when under a lot of pedal pressure. You can't really tell from the pic,s as at an angle.
    Too many bikes according to Mrs O.
  • I wouldn't have thought your chainrings need replacing after 6500 miles.

    Incidentally I've always replaced 11 speed chains ASAP after 0.5 wear rather than 0.75.
  • I have definitely let the chain go too far this time - it's a right state and in places it has reached 1% worn

    It would seem a shame to spend £75 on the chain + cassette (have gone for an Ultegra cassette and a Dura Ace chain this time) and then for the crankset to limit the difference so I am on the fence

    I'll get a better picture tomorrow when it is light
  • oxomanoxoman Posts: 8,376
    I've found the higher the groupset the quicker it wears out. I stick with 105 cassettes and kmc chains. I only use ultegra or above on brakes or rear mechs. What weight you save with the higher lighter groupsets is probably not going to be noticeable to most cyclists.
    Too many bikes according to Mrs O.
  • As an update - I fitted my new cassette and chain tonight and the shifting is perfect. Based on that I'm going to stick with my current crankset until I change the cassette again

    I'm making the assumption that my chainrings are only 50% worn (which may or may not be correct) - worst case scenario is that I don't get through three chains on my next cassette if I need to change chainrings earlier than planned




  • paulwoodpaulwood Posts: 215
    For me outer chainring = about 3 cassettes= about 10 chains
    Not done an inner chainring as long as I can remember
  • paulwood said:

    For me outer chainring = about 3 cassettes= about 10 chains
    Not done an inner chainring as long as I can remember

    My inner chainring looks like new still

    I guess it's used about 2% as much as the outer though
  • cruffcruff Posts: 1,521
    I change my chain every 2000km, and cassette every 3 chains. I put three cassettes through my Ultegra groupset before the front chainring started slipping after changing the cassette the third time - so got about 15000km out of it. Agree that 105 is harder wearing than Ultegra - though not by much (and certainly not as much as the difference between 105 & Dura-Ace - which has the longevity of cheese)
    Fat chopper. Some racing. Some testing. Some crashing.
    Specialising in Git Daaahns and Cafs. Norvern Munkey/Transplanted Laaandoner.
  • cruff said:

    I change my chain every 2000km, and cassette every 3 chains. I put three cassettes through my Ultegra groupset before the front chainring started slipping after changing the cassette the third time - so got about 15000km out of it. Agree that 105 is harder wearing than Ultegra - though not by much (and certainly not as much as the difference between 105 & Dura-Ace - which has the longevity of cheese)

    I will be interested to see how long this chain lasts then!

    I normally get just over 2,000 miles out of them, but I do think I leave them on too long
  • Those rings are not worn. Also change your chains sooner. The cassettes will last alot longer.

    Leaving it to 1% wear for me means a dead small sprockets.
    www.thecycleclinic.co.uk
  • mrdsgsmrdsgs Posts: 331
    I start a new cassette with 3 new chains and rotate them every 500 miles. If the outer chainring is in good condition when I start I would expect 5 , sometimes 6 uses per chain, before changing everything again. So at least 7500 miles. Significant initial outlay but cost effective in the long term. Usually Ultegra or Dura Ace or Chorus cassettes. and KMX X10 or X11 SL chains ( £30 ish each direct from China) . Been doing this with 10 and 11 speed setups for years.
    Colnago Addict!
  • mercia_manmercia_man Posts: 1,375
    edited November 2019
    Those chainrings look fine to me. There’s no point in replacing them until you need to.

    It is quite obvious when rings are worn. They develop a hook-like appearance, like sharks’ teeth, as has been said above. You may also get some transmission slip, particularly if you fit a new chain.

    I have to replace the inner TA alloy 24-tooth ring on my touring bike’s triple every few years. Alloy wears more quickly than steel and the fewer the teeth, the higher the rate of wear.

    Shimano rings do wear out more quickly because they have shallower, more highly shaped teeth to enable smooth shifting. In my experience, Campag rings, which are more traditional in shape, last significantly longer.
  • Thanks all, glad I held off and saved £100

    Love the feeling of a new chain! Pleasant surprise every time
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