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Middle Ring for Shimano M770 HT2
#1
Right - this is giving me grief, and a worse headache than I already have..

Im after a new middle-ring for my crankset, but have learned than it needs to be totally specific for this crankset.

I have a Hollowtech 2 M770 Crankset.
http://cycle.shimano-eu.com/publish/cont...type-.html


A few people have already said to try a Middleburn as they are better, but the official "XT" version doesnt state "M770" in its list of supports cranksets......  Undecided

So does this "force" me to only buy Shimano?

http://www.merlincycles.co.uk/mountain-b...rings.html

http://www.chainreactioncycles.com/Model...elID=38184

Surely there are "aftermarket" rings i could look at, as If I can buy a longer lasting one, I will.......

The set is a standard 104/64 BCD, so wouldnt a stanrds 32t middle ring work???
http://www.chainreactioncycles.com/Model...delID=3331

Any advice?
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#2
Look at the hole positions... dosn't look like any old 104 would fit as it looks like the holes are further apart. Unless Blackspire or some other after market company do M770 specific ones it looks like you are stuck with Shimano. But as the teeth are steel, it might actually be cheaper in the long run as it'll last longer? How old is your current middle?
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#3
about 14 months old. as I've bought a cassette and new chain, was thinking a wise
move to make.
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#4
"Treehugger" Wrote:Look at the hole positions... dosn't look like any old 104 would fit as it looks like the holes are further apart. Unless Blackspire or some other after market company do M770 specific ones it looks like you are stuck with Shimano. But as the teeth are steel, it might actually be cheaper in the long run as it'll last longer? How old is your current middle?

If you go down the "Blackspire" route I have a trade account with them so can possibly save you a few pennies..... Also have a place I can get O'Neil stuff at trade as well if you want some body armour in the future
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#5
Surely you can just look at the teeth? mines about 14months old and is missing a tooth, still going strong.
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#6
I dont think I have much other option bit to go shimano though... I'm cornered by the corporation!
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#7
"BMJBOY" Wrote:I dont think I have much other option bit to go shimano though... I'm cornered by the corporation!
Wait until you get the new chain and cassette, as you don't always have to change it all togather. The one i got in Scotland last year wore out, and i pinched the one off my Dads bike which came with my old 2 year old Carrera which i then ran for another year, and it was fine and i could have continued running it longer but as i run double and bash needed to get another 36 tooth.
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#8
The 770 is listed as a 104/64 chainset, but Middleburn do offer a XT Hollowtech II 32T ring, so that makes me believe there is something different about it, but Middleburn offer them, so it doesn't matter ;D

I get the impression you are replacing because you think you should. Is it worn out?

[edit] There appear to be several instances of people struggling to fit Middleburn rings to HT II's, suggestions of a width difference. If you're after slick shifting use Shimano. If you're after durability Middleburn are better, but Deore steel ring will be waaaay better! [edit]
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#9
im only looking as as previously mentioned I've been running the same chain and cassette too for a similar time.

therefore I'm assuming the worst and expecting issues when the new chain is on.

seeing as Wales is fast approaching, I'm just budgeting early as it would be the sensble option.

right, the middleburn option doesn't seem to support my m770, or at least it says for m### only.

I've not found 1 aftermarket ring which clearly states it's compatible with m770.

plenty are saying 104bcd or "hollowtech xt" but the further Reading say "not compatible with xxxx or blah blah"

confused.... yep.

I'll wait until my bike is back to the ring a proper look over, but I have to take te chanset off anyway as I have a bling hope bb to put on also.
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#10
<!-- m --><a class="postlink" href="http://www.rei.com/product/778832">http://www.rei.com/product/778832</a><!-- m -->

That says the ring is a 104BCD, Have found a deore one here with the same measurements : <!-- m --><a class="postlink" href="http://www.sjscycles.co.uk/product.asp?pf_id=3090&src=froogle">http://www.sjscycles.co.uk/product.asp? ... rc=froogle</a><!-- m -->

Dont know if im right but the measurements add up ?
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