XT M739 Chainset Question.

[jimo746]

I have a Shimano XT M739 chainset on my Proflex, I recently had to change the middle chainring due to wear & tear.
The outer ring could do with replacing soon as well but.... what is going on?

It looks like the outer ring is joined to the crank spider? so I guess a regular 4-bolt outer ring won't fit?

Where can I get a replacement outer ring?

 

[jonnyboy666]

i think shimano is pretty much the only option on these, they do pop up on ebay every now and then and the lx version also fits but it's a black ring as opposed to the silver xt version.

although you may end up special ordering it from a shop but that means paying proper shimano rrp :shock: which could make it financially silly.

maybe look for another chainset in 5 bolt compact, the m737 xt for example, i think it takes the same b/b and has the same ring size but 5 bolt rings seem to go way cheaper coz no one (apart from us lot) is using them.

 

[jimo746]

oh... and I just bought a Middleburn 32T 4 bolt middle ring as well... :cry:

I'll soldier on with the outer ring, and will look into the Shimano outer rings in 4-bolt pattern.

What a stupid system! what were Shimano thinking??!! :evil:

 

[jonnyboy666]

they were thinking about forcing you into buying their spares and no one elses! :roll:

 

[one-eyed_jim]

I spotted these at defietsenmaker.nl a couple of days ago:

http://www.defietsenmaker.nl/index.php? ... 49&lang=EN

Not cheap, but available. They also pop up on eBay from time to time. The other option is to fit a replacement spider that will take conventional chainrings in either 4- or 5-bolt patterns.

 

[jimo746]

Thanks for that link, the XT ring is exactly what I am after

The other option is to fit a replacement spider that will take conventional chainrings in either 4- or 5-bolt patterns.

You mean a new crank & spider?

 

[Xesh]

You mean a new crank & spider?

No. Shimano made a spider that you could fit to these cranks that accepted conventional chainrings.

 

[one-eyed_jim]

Shimano made a spider that you could fit to these cranks that accepted conventional chainrings.

http://www.paul-lange.de/fileadmin/paul ... 9-5-97.PDF

If it's actually available, this is a very good price:

http://www.petracycles.co.uk/fcm739-5ar ... -5127.html

 

[jimo746]

Brilliant! Retrobike to the rescue once again!

 

[cornholio's RC200]

And here it is in action on my much lamented 856