Broken bash ring

smacl

Cycling along this morning, the bike came to a sudden stop with a crunching sound. The chain had come off, and what I'm guessing is a bash ring was broken in half tangled in the chain. Could probably super glue it back together and bolt it back on, but would rather buy a new one. I'm assuming its function is to stop the chain inadvertently coming off when moving into the big ring. Problem is I don't know what size replacement to get, or whether I'm even looking at the right component. Its going onto a Deore triple, and has 4 bolt holes. The outer diameter of the broken part appears to be 195mm, or 15mm from centre of bolt hole to centre of opposite bolt hole. It's a pretty crappy plastic affair, with no writing visible on it.

Can anyone recommend a replacement, and are they easy to fit? The broken one didn't seem to be bolted on at all which is also a bit strange, though I guess the bolts could have rattled off over time. Also, would a replacement usually come with the necessary screws / bolts, or do I need to get these separately

Crasp

That's defo not a bash ring! a bash ring is steel or 8mm aluminium!

that's just to stop your pants getting caught on the sprocket. Looks like you'll have to start tucking your pant into your sock

You should be able to pick up a replacement in any major bike shop.


Those 4 bolt holes are where it bolts on to the crank arm. I'd be checking your sprockets are still attached!

and if you didn't notice them rattling lose, I'd go ahead and give your brakes a thorought check too....

smacl

Crasp wrote: »

that's just to stop your pants getting caught on the sprocket. Looks like you'll have to start tucking your pant into your sock

If that's it's only function, I'm not too concerned, as we're in shorts season. My suspicion though was that it was also there to stop the chain coming off when shifting into the big ring, which would be more of a concern. I notice a similar attachment on the cassette which is no where near any clothing.

Those 4 bolt holes are where it bolts on to the crank arm. I'd be checking your sprockets are still attached!

and if you didn't notice them rattling lose, I'd go ahead and give your brakes a thorough check too....

Yeah, this just happened after putting the bike in for a service last week in preparation for the WW200. I think I'll be giving everything a thorough check this evening.

Crasp

smacl wrote: »

If that's it's only function, I'm not too concerned, as we're in shorts season. My suspicion though was that it was also there to stop the chain coming off when shifting into the big ring, which would be more of a concern. I notice a similar attachment on the cassette which is no where near any clothing.



Yeah, this just happened after putting the bike in for a service last week in preparation for the WW200. I think I'll be giving everything a thorough check this evening.

No i don't think so, if you have gears up front, the front mech should be keeping the chain on if it's set right. This just stops things getting caught up in the chainring.

you might be right thou, if the cassette also has one.. that would inevitably be to stop the chain getting mashed between the spokes and cassette when it does come off..

Holyboy

All its there to do is to stop your trousers getting caught in the chainring,it usually doesnt stop that anyway,some guards are screwed to the large chainring and some are just press fitted,just take it off and forget about it,if you REALLY want to replace it it can be hard to get originals you would probably have to settle for an after market one that fits to the actual crank where it bolts to the axle,theyre usually ugly though!as for the rear,it is supposed to stop the chain from damaging the spokes in the case of an over shift but they dont tend to work to well,properly adjusted mechs are all that is needed.

smacl

Thanks for that, good to know its not a vital component before a big day out.