when to replace chainrings

[brussel]

OK so there has been more than enough discussion on chain length and replacing cassettes etc.

 

 

 

but when do you replace chainrings? They don't have the skipping issues that a worn cassette will have. So how do I know if I need to replace or not?

[Johan Bornman]

Chainrings only need replacement if:

1) The teeth are so worn, you worry that they will cause the chain to skip

2) They cause chainsuck even under clean conditions.

 

The smaller the chainring, the more likely that it will cause chainsuck. Large rings almost never such, no matter how badly they're worn. A MTB middle ring is the optimal size for sucking and needs replacing long before it makes you think of shark fin soup.

[Canaris]

when they are worn.......

 

normally, you will find that chains don't last, even with a new cassette.  Run your finger over the teeth of the blades.  If they are really rough, ie cuts your finger, then just think what it is doing to your chain.  If they are missing some teeth or are bent, then that too is a good sign to replace.

[Aquatic]

Many people change them on the 'serious service ' period..there is no straight answer,we have to look at mileage,conditions,general maintanance etc. I have seen many mtb and road chainrings being replaced just for the sake of doing it..the best way is to look at the teeth,if they look like blunt shark fins,it may be time to change..when doing so,look at cassete and chain wear as well

[splat]

Do worn chainrings wear out or damage a chain like worn cassettes do?

[Johan Bornman]

Do worn chainrings wear out or damage a chain like worn cassettes do?

 

No.

[Aquatic]

It does eventually damage it,as your shifting between the chain rings(big/small) becomes compromised and wear occurs

[Mackie]

Do worn chainrings wear out or damage a chain like worn cassettes do?

 

No.

Out of interrest, why?

[brussel]

I have slx cranks and the middle ring is steel composite and it looks as good as new. My small one is in good nick as well. The large one has taken the most abuse. The teeth are quite blunt - but NOT sharkfin shaped. The SLX chainrings (large anyhow) had fairly blunt teeth st the start.

 

 

 

I don't want to replace if I don't have to and the shift fine. I was replacing my cassette and chain so I was checking. (my last bike O rode for 6 years with the same rings )brussel2009-09-01 06:38:10

[ShaughnK]

I was told to change mine the other day because my I was battling to change gear and getting some chainsuck.

 

The LBS tech said my "ramps" were worn on the chain rings.

 

The teeth were pretty worn on all three chain rings anyway, so used the opportunity to upgrade.

 

But I wondered to myself.... ramps ??

[Johan Bornman]

It does eventually damage it' date='as your shifting between the chain rings(big/small) becomes compromised and wear occurs[/quote']

 

Please explain to me how a worn chainring compromises shifing and how it then wears the chain.

[Johan Bornman]

Do worn chainrings wear out or damage a chain like worn cassettes do?

 

No.

Out of interrest' date=' why?[/quote']

 

Search for a posting with me as the author and some keywords from the phrase "Everything you need to know about bicycle chains".

 

I explained it in there.

 

 

[Aquatic]

It does eventually damage it' date='as your shifting between the chain rings(big/small) becomes compromised and wear occurs[/quote']

 

Please explain to me how a worn chainring compromises shifing and how it then wears the chain.

look closely at a chain ring,it is an engineering marvel!each edge of the tooth is milled to help with the upshift down shift.when the edge gets worn,it doesnt guide or accept the chain well fr6 the chainring pins,hence the chain other slips or not shift over at all,wearing the chain,.the wear is not as bad as a worn cassete would wear

[Johan Bornman]

It does eventually damage it' date='as your shifting between the chain rings(big/small) becomes compromised and wear occurs[/quote']

? 

Please explain to me how a worn chainring compromises shifing and how it then wears the chain.

look closely at a chain ring,it is an engineering marvel!each edge of the tooth is milled to help with the upshift down shift.when the edge gets worn,it doesnt guide or accept the chain well fr6 the chainring pins,hence the chain other slips or not shift over at all,wearing the chain,.the wear is not as bad as a worn cassete would wear

 

I think you are making this up as you go along.

 

 

[Aquatic]

It does eventually damage it' date='as your shifting between the chain rings(big/small) becomes compromised and wear occurs[/quote']

?nbsp;

Please explain to me how a worn chainring compromises shifing and how it then wears the chain.

look closely at a chain ring,it is an engineering marvel!each edge of the tooth is milled to help with the upshift down shift.when the edge gets worn,it doesnt guide or accept the chain well fr6 the chainring pins,hence the chain other slips or not shift over at all,wearing the chain,.the wear is not as bad as a worn cassete would wear

 

I think you are making this up as you go along.

 

 

Quite simply i am not really concerned if you think i am making this up mr johan,however,i would reccomend you read the Bicycling issue April 2008,it explains how chainrings work,the pins,the grooves etc. Then spend a day in a lbs workshop,and observe chainrings and shifting ,cheers!

[Tieffels]

This could get interesting, Johan go easy on the youngster.. Rather sign him up for a workshop, esp seeing that he is part time in a bike shop. Allegedly.