Chainring Advice

jerryfudd

Hi,

My commuter has been jumping under load so I'm replacing the rear cassette and chain - can someone advise me on the wear of the chainrings and if they need replacing also or how much life is left in them.





Some of the teeth look flattened off but I saw somewhere but sometimes it can be on purpose to aid shifting?

thanks,

Dan

nicklouse

looks OK to me.

concorde

Granny ring is starting to shark tooth but don't think it'll cause too much worry. Other rings are fine.

jerryfudd

Concorde wrote:

Granny ring is starting to shark tooth but don't think it'll cause too much worry. Other rings are fine.

thanks, shows what i know i was looking at replacing the middle and outer

....are the flat teeth meant to look like that then?

Dan

nicklouse

yes see viewtopic.php?f=40073&t=12648300

No Sweat

Hard to tell just by looking at the chainrings...

The only real test will be when you have the new chain. When you have assembled it all, if the chain rings are not too worn, the new chain will fit snugly around the chainrings. If you can see a gap between the chain and the chainring (i.e. in 'valleys' between the 'teeth' - sorry for mixing metaphors there) and the chain feels 'slack' if you try to move it around on the chain ring, then the old rings are probably too worn and will prematurely wear the new chain and therefore the new cassette as well.

Chunkers1980

The granny looks fine. They are deeper than the rest as it only needs to shift up.

From the front on picture just around 12 o'clock above the mega nine sticker the flat part there and ones similar are meant to be like that as it is a shifting aid.

Ouija

Concorde wrote:

Granny ring is starting to shark tooth but don't think it'll cause too much worry. Other rings are fine.

Actually, the granny ring on SLX comes with that shark tooth design when new (unlike a lot of granny rings) which can be a bit misleading. In fact, all three rings start out with a slight shark tooth design to them on SLX, especially the composite middle ring. Though non of that applies to the touring version of the SLX with the larger 26/36/48 combination.

The Rookie

To me the middle ring looks a bit too worn for my liking, other 2 look fine.

jerryfudd

The Beginner wrote:

To me the middle ring looks a bit too worn for my liking, other 2 look fine.

thanks all, what are you checking for Beginner?

Dan

Ouija

For Comparison.....

SLX 22

SLX 32

SLX 44


note the slight shark toothing as standard. Can mislead you into thinking they are more worn than they are (on more traditional rings i'd be thinking of replacing them if they looked like that too)

The Rookie

jerryfudd wrote:

The Beginner wrote:

To me the middle ring looks a bit too worn for my liking, other 2 look fine.

thanks all, what are you checking for Beginner?

Dan

Just looking at the shape of the valleys between the teeth, I'm not saying it is (or isn't) worn, just looks like it may be!
Unless it's really bad you won't tell from a photo for sure.

jerryfudd

thanks all, I think im going to stick the new sprocket and chain on and see how the fit looks.

thanks again,

Dan