Chain, Cassette and Crankset Replacement

flight147z

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

flight147z

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

ibr17xvii

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.

flight147z

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

flight147z

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

paulwood

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

flight147z

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

cruff

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)

flight147z

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

thecycleclinic

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.

mrdsgs

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.

mercia_man

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.

flight147z

Thanks all, glad I held off and saved £100

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