Changing the chainring

[RecordAceFromNew]

See this. Chance is good that once the crank bolt is removed (likely with an allen key), chainset will wriggle free.

Are you sure 3 chain rings is cheaper than a (comparable) chainset?

 

[benb]

See this. Chance is good that once the crank bolt is removed (likely with an allen key), chainset will wriggle free.

Are you sure 3 chain rings is cheaper than a (comparable) chainset?

The Shimano Deore M590 is £57.99
The individual chainrings are £51.97
I suppose for £6 I could just as well get the whole set.

Any idea whether I need the 170mm or the 175mm?

Cheers.

 

[PpPete]

170mm is "standard"
Get the 175 if you is a big bloke

 

[RecordAceFromNew]

The Shimano Deore M590 is £57.99
The individual chainrings are £51.97
I suppose for £6 I could just as well get the whole set.

Are you sure the M590 is octalink?

 

[benb]

170mm is "standard"
Get the 175 if you is a big bloke

Big as in fat, or tall? I'm both, so I'll go for the 175.

Before I order, please can someone let me know if the crank extractor is required, and if so whether the Cyclo Cotterless Crank Extractor With Handle, Splined will work with the Octalink BB?

 

[RecordAceFromNew]

It is safer to use a crank extractor (since wriggling it MIGHT damage the alloy splines) if your set up does not have self-extraction bolts.

 

[benb]

Are you sure the M590 is octalink?

Description doesn't make it clear
http://www.chainreactioncycles.com/Models.aspx?ModelID=40496

But it does say the BB is included, but no detail about it.

 

[PpPete]

That's Hollowtech II
So the crank extractor for splined will be redundant after getting old one off. You will however need a (completely differnt) HTII tool to get the new one one.

 

[benb]

Looks like the BB on the crankset is Hollowtech II, so I guess I'd also need a Octalink BB tool to get the old one out, and then a Hollowtech II tool to put the new one in. http://www.chainreactioncycles.com/Models.aspx?ModelID=42809

So maybe I should go back to plan A of getting the individual chainrings.

 

[RecordAceFromNew]

No need for description. The big round hole in the middle of the M590 where the spindle would have gone says it is Hollowtech 2, meaning you need a HT2 bb tool unless you have one already.

Obviously it is your money etc., but I would be surprised if blindfolded you can tell the difference between the M590 and the £30 M443 direct replacement from sjs. However, is your bb in good condition?

If you haven't got many bike specific tools already, it might be cheaper in the long run to buy a tool set.

 

[MacB]

Looks like the BB on the crankset is Hollowtech II, so I guess I'd also need a Octalink BB tool to get the old one out, and then a Hollowtech II tool to put the new one in. http://www.chainreactioncycles.com/Models.aspx?ModelID=42809

So maybe I should go back to plan A of getting the individual chainrings.

If you want individual chainrings then I might be able to help as I want to buy another Alivio chainset, we could share the price, here:-


http://www.parker-international.co.uk/5561/Shimano-Alivio-M410-4-arm-Chainset.html

if you buy this then you can keep the rings and bolts and send me the two crankarms, I'll pay £15 for my share of the deal.

 

[benb]

Yeah, BB seems fine, so I'll either get the individual chainrings for £51.97, or the M443 linked above for £29.99
Absolutely no point getting the Deore and all the extra tools for £81.97

Or, final option, (as longer cranks appeal) I get this:
http://www.sjscycles.co.uk/shimano-alivio-m410-octalink-triple-chainset-22-32-42t-prod23796/

 

[benb]

If you want individual chainrings then I might be able to help as I want to buy another Alivio chainset, we could share the price, here:-


http://www.parker-international.co.uk/5561/Shimano-Alivio-M410-4-arm-Chainset.html

if you buy this then you can keep the rings and bolts and send me the two crankarms, I'll pay £15 for my share of the deal.

Sounds good. Let me decide whether I want to get 175mm cranks or not, and if not I'll take you up on that.

 

[RecordAceFromNew]

Or, final option, (as longer cranks appeal) I get this:
http://www.sjscycles.co.uk/shimano-alivio-m410-octalink-triple-chainset-22-32-42t-prod23796/

I was wondering why would a M410 be more expensive than a M443, then of course MacB's link above shows that you could get your 175mm M410 for £25+p&p

 

[baldycyclist]

yes it will - try it slowly with the disc in - if it starts to resist then you are fine