Worn teeth on chainring of two month old bike

tom101

Just noticed whilst cleaning my bike that two of the teeth on the biggest chainring are severely worn, down to apart half their normal size. The bike was bought in April and I've done around 300 miles on it. Obviously I'll be taking it back to the shop but does anyone know the likely cause of this so I don't get fobbed off?

markmod

Whoaaa, hang on there a minute, many modern chainrings have a smaller tooth on the ring to cause the shift point from one ring to the other, don't be too hasty to complain before you tell us all what make and model of chainset you have.

Does it look like this http://www.google.co.uk/m/search?site=images&gl=uk&client=safari&source=mog&hl=en&aq=f&oq=&aqi=-k0d0t0&fkt=1559&fsdt=7548&q=smaller+tooth+on+chainring+for+shift#i=44

Pokerface

Smaller teeth on the chainring are there to help grab the chain from the small ring.

Nothing to worry about.

ADIHEAD

I recently had a problem with a Sram Rival chainset I sold on ebay - the buyer had the same concerns lol

Sometimes it's best to just ride the thing and not worry unless there's a problem hey? We've all been there :roll:

Pokerface

Well - fair question from someone not used to these things!


I've been riding for years and I even had to ask someone at the shop about these teeth. Sram cassettes are MISSING some teeth!

tom101

I feel like such a fool!
:oops:

Although I'm glad I asked here first rather than going all the way back to the shop.

I'll post a picture later just to be sure anyway.

ADIHEAD

Yeh I did the same actually a couple of years ago What I meant was when you're riding you're not looking for problems. It's only when you look you start worrying so best not to sometimes. Don't even start me with the things I've taken my car into a garage for! Oh go on then, I once bought a really sexy set of Pirelli's for a 205GTI that was my pride and joy. Kept hearing a ticking noise whilst driving at low speed with the windows open - anyone guessed it yet? Yep the new tyres had picked up stones and I was hearing that - I was only 20 :roll:
Problem was it was one of the mechanics where I worked that checked it so it took a few weeks to live down :oops:

markmod

Don't feel a fool mate, we are all still learning, just at different levels... Also makes you realise how cleverly the bits of a bike are designed nowadays... A lot of tech for your money.

fungus_the_muffin_man

I had the same thought the other week when I was giving my bike a real good clean down. It was only when I started looking for a new one online that I noticed that when the pic was enlarged the teeth were milled to grind down to the way mine were now.

i'd never noticed this before. When your still relatively new to stuff the only way your gonna learn is when things start to happen to you for the first time.

Determination

tom101 wrote:

Just noticed whilst cleaning my bike that two of the teeth on the biggest chainring are severely worn, down to apart half their normal size. The bike was bought in April and I've done around 300 miles on it. Obviously I'll be taking it back to the shop but does anyone know the likely cause of this so I don't get fobbed off?

Maybe you should go easier on those long climbs

bexley5200

just boch it

benpinnick

Tom, if I had a quid for each time someone had asked me about taking chainrings back because they've 'worn out really quick'... I'd probably have a fiver by now. You are i na surprisingly large gang of people who've fallen for that one!