What's this called?

[MossCommuter]

It goes between the pedals and the big cog; all of the bolt holes have sheared and I need a new one.

What do I need to ask for?

Are they a standard fit?

Are there better quality ones (metal perhaps)? This is plastic and flimsy.

Thanks

P

 

[Cheule]

Bash guard?

 

[Sittingduck]

Think it might be specific to your chainset. That's off a Specialized hybrid isnt it?

 

[MossCommuter]

Bash guard?

Now, why didn't that occur to me!? Thanks!!!

A quick google found some (also known as bash-rings)!

Excellent.

Now to work out if any four holed one will fit - thanks! (and I also turned up some "fastener kits", so I guess I have to buy one of those too)

Think it might be specific to your chainset. That's off a Specialized hybrid isnt it?

It's a Scott Hybrid... It says "Dual SIS Index" on it

 

[Will1985]

Measure the distance between adjacent bolt holes. Sheldon will help you (see first entry = Bolt Circle Diameter).

 

[ufkacbln]

If it helps the fittings for rings are normally measured by the Bolt Circle Diameter (BCD)

Measure this and quote it to a bike shop or supplier and it should guarantee a fit

 

[martint235]

I'd ask if you actually need one. Didn't get one on my road bike, took it off my mountain bike. If you wear trousers or jeans to cycle then you probably need one, it just stops stuff getting caught in the chain.

 

[MossCommuter]

Thanks everyone; all very useful information.

I think i do need one - after all, if something has been bashing it to the extent that it's broken then it's done its job in protecting the chainset behind it.


EDIT:
-----------------

OK, it's a minefield. It seems the bash-guards I have seen online are intended to replace one of the chain rings (going from three to two). The one I have goes over (i.e. attaches to) the third one and is, apparently, merely to protect clothing from oily chain.

Maybe so, but I want to replace it because a) something knocked it off b) I just want to.

I contacted Scott (the manufacturer of the bike) and they will not deal with me directly but asked that I get a LBS to ring "Madison" and source one from them.

The nice man Dan from Evans is on the case.

 

[P.H]

I'd call it a chainguard rather than a bashguard.  Chainguards are designed to protect you from the chain, bashguards are designed to protect the chainrings on a MTB from getting bashed, they're a lot stronger than needed for any other purpose and often replace the outer ring on a triple.  Google brings up plenty of examples. 

 

[battered]

As said, it's a chain guard not a bash guard. You won't break a bash guard unless you regularly bounce the thing off rocks. A chain gurad though just leeps your trousers out of the chain. I'd leave it off and just tuck my trousers in my socks. BTW I just replaced a chainset after 15000 miles, the inner rings were worn out but the ouyer ring still OK, albeit with the odd knock.

 

[MossCommuter]

Google brings up plenty of examples.

I can't find them

 

[snorri]

I can't find them

Googling "chain guard" throws up loads of examples, but the prices range from £10 to £70.

I think the first thing to clarify is, do you wish to protect the chain ring or your trousers?
I have a plastic chainguard which I find very effective at keeping socks and trousers oil-free, but would be quite ineffective at protecting the chain ring if I chose to go cycling over rocks.

 

[MossCommuter]

do you wish to protect the chain ring or your trousers?

Now I know what it's for, I think my main motivation is to keep the bike "original condition". I don't wear longs.

I think I know what made it break off, by the way, 'cos now it's missing, the chain has been going over the top on the up-change so the gears were not adjusted properly so maybe it was deflecting back off it and stressing it in so doing. I had a twiddle and hope it should be ok now.

Still, I would like to replace it (maybe I'm a bit OCD)

 

[irw]

+1 for replacing it to protect your trousers. Mine broke off a few months ago, and I've not got round to replacing it yet. Since then, pretty much most of my trousers have got caught up in the chain at some point. The soon to be Mrs. IRW is not amused!

 

[fixedfixer]

Try Saint John Street Cycles and put chainguard in the search box. Quite a few on that site. You need to know your PCD and the number of teeth on the outer cog.