Replacement Chainset

[Forkbeard]

Can anyone give me some advice on replacing a chainset? I’ve got a 2001 Kona Blast that’s got a TruVativ 6D, 24/32/42 on it. I’ve really got no idea what I’m looking for. Do the number of teeth matter? Or is that a stupid question?

Cheers,

James.

[tomlevell]

Are you just wanting to change the chainrings?

Just buy the same sizes again and make sure that what your buying will fit. How many arms the spider has (probably 4) which gives you the bolt circle. Only problem is for example Shimano chainrings don’t fit on Race Face cranks so I don’t know if that affects Truvativ or not.

[Forkbeard]

Are you just wanting to change the chainrings?

I was thinking about replacing the whole lot.

[tomlevell]

The cranks are probably square taper and most “better” cranksets now are a spined or external bearing so you’ll have to get a new BB as well. There are plenty of square taper units out there but they tend to be really cheap or really expensive.

If there is nothing wrong with the cranks or BB just replace the chainrings.

[Forkbeard]

To be honest I’m not really sure what’s wrong with what…I got the bike second hand and the guy who sold it me said the bottom bracket, chainset etc. might need replacing soon. The only thing I know for a fact is wrong with it is that the biggest chain ring is slightly bent. I can’t see anything physically wrong with the actual cranks apart from they’re really badly scratched.

[tomlevell]

Take the big ring off and straighten it. Or try doing it with it on the bike.

[BMR]

It is quite easy to level up the big chain ring whilst its on the bike I did it on my Coke bike. Took the chain off, took the front mech off and with a strong block of wood across the frame tubes and a long pry bar to prise the ring up. Rotate the crank and with a typex pen mark where it needs bending and gently a little at a time raise the ring back to its correct shape, if you bend it too far tap it back using a block of wood and a hammer. It takes a little time but it can be done. Mine was 10mm out and now its only a few thou which is nothing.

[Forkbeard]

I’ve been out for a half decent ride on the bike today and it’s not the only problem. Apart from it being bent, there are also a few damaged teeth. Couple that with the fact that the left arm keeps falling off, I might just replace everything. Depends how much it’ll cost though…And I don’t really know what I’m looking for. What else would I need for the Shimano in the link?

I was looking at this: http://www.chainreactioncycles.com/Models.aspx?ModelID=20679

[donkey]

I have a kona fire mountain and i upgraded to shimano deore xt chainset and has awesome performance will cost about £140 but its worth it. 🙂

[brianbrian]

Last week got an Shimano XT Chainset M770 for £129.95 from Noah Ark in Gloucestershire. http://www.noahsark.co.uk with free delivery. It replaced my old XT one which wore out but I think its worth spending the money.

[SeanO]

Just googled to see if that was a good deal. Seems ok and on par with the rest of the market. However, on the same search it showed £80 😯 for and outer ring ONLY!!! WTF!!

Also its from a respectable bike store that has good service. Not sure I can keep riding a bike at those prices 👿

[BMR]

Sean,

Convert your old one into a frisbee and fit an e13 bash ring. much cheaper after all how many times do you use the outer ring?

Brian

[SeanO]

Sean,

Convert your old one into a frisbee and fit an e13 bash ring. much cheaper after all how many times do you use the outer ring?

Brian

I’ve been running a double & bash setup for a while, just commenting on how expensive the chainring and other kit seems to be lately.

I bought a full XT M760 crankset about 3 year ago for £70.

[Steve Kish]

Take the big ring off and straighten it. Or try doing it with it on the bike.

Grind off the teeth, unless you use it a lot. ‘Two & A Bash’ FTW!! 8)