splat Posted January 17, 2017 Share Can anyone tell me what sort of mileage I can expect from my chainring?And how I can tell if its worn? It has about 4200km. I haven't ridden much in the rain or mud. It gets a hose down after most rides. The chain is lubed before every ride. I changed the 1st chain at about 1850km, and am pretty sure the 2nd chain is up for renewal too (and probably the casette too) And while on the topic: does anyone know who stocks the newer CRM81 rings.they were launched last year: http://bike.shimano.com/content/sac-bike/en/home/news-and-info/news/11-speed-mtb-drivetrain-additions.htmlBut seem to be like rocking horse poop... They are different from the standard or original CRM80 rings Link to comment Share on other sites More sharing options...
splat Posted January 18, 2017 Share No pearls of wisdom from anyone? Ok, so CoolHeat only have 30 and 34T CRM81 rings, but won't order more 32T until they have sold all the older CRM80 rings (and they still have about 300 of those...) Link to comment Share on other sites More sharing options...
Bizkit031 Posted January 18, 2017 Share No pearls of wisdom from anyone? Ok, so CoolHeat only have 30 and 34T CRM81 rings, but won't order more 32T until they have sold all the older CRM80 rings (and they still have about 300 of those...) Typical of them. Link to comment Share on other sites More sharing options...
JXV Posted January 18, 2017 Share You will get more milage if you buy 2 (or 3) chains and regularly alternate them than if you sequentially replace chains as they wear out. Admin and more upfont cost but if you're the organised type maybe not a big thing to deal with. Fitting a new chain after a worn one accelerates tooth wear until they both settle in to each other. If you already got 4200km from a ring then buying same again should be OK? Not terrible milage. As long as the rings shift ok and are not slipping, keep using them. Those CRM81 rings are proper NW rings whereas the older CRM80 claimed all sorts of special tooth shaping for chain retention without NW teeth. Makes you realise that 90% or more of the usual hype is just marketing BS Sent from my SM-G935F using Tapatalk Link to comment Share on other sites More sharing options...
Sidmouth Posted January 18, 2017 Share http://www.chainreactioncycles.com/shimano-xt-m8000-single-chainring/rp-prod135832 Link to comment Share on other sites More sharing options...
Mr lee Posted January 18, 2017 Share You will get more milage if you buy 2 (or 3) chains and regularly alternate them than if you sequentially replace chains as they wear out. Admin and more upfont cost but if you're the organised type maybe not a big thing to deal with. Fitting a new chain after a worn one accelerates tooth wear until they both settle in to each other. If you already got 4200km from a ring then buying same again should be OK? Not terrible milage. As long as the rings shift ok and are not slipping, keep using them. Those CRM81 rings are proper NW rings whereas the older CRM80 claimed all sorts of special tooth shaping for chain retention without NW teeth. Makes you realise that 90% or more of the usual hype is just marketing BS Sent from my SM-G935F using Tapatalk So in your opinion the CRM81 is the one to go for then...? Link to comment Share on other sites More sharing options...
JXV Posted January 18, 2017 Share So in your opinion the CRM81 is the one to go for then...?Why else would they change them so soon after releasing M8000 series? Sent from my SM-G935F using Tapatalk Link to comment Share on other sites More sharing options...
Mr lee Posted January 18, 2017 Share Why else would they change them so soon after releasing M8000 series? Sent from my SM-G935F using Tapatalk Okay Link to comment Share on other sites More sharing options...
droo Posted January 18, 2017 Share Try a CSixx TT ring. Local is lekker, and there's stock for days. I have a 32T M8000 ring on the shelf if you want to give it a go. Link to comment Share on other sites More sharing options...
splat Posted January 27, 2017 Share Ok, so CoolHeat only have 30 and 34T CRM81 rings, but won't order more 32T until they have sold all the older CRM80 rings (and they still have about 300 of those...)I ordered a 32T CRM81 ring from Jenson's while my sister is in US&A this week.Cost me R731.00(Compared to R1250 locally. If it were available...) Link to comment Share on other sites More sharing options...
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