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PostPosted: Sun Feb 17, 2013 4:14 pm 
Old School Hero

Joined: Sun Aug 08, 2010 11:35 am
Posts: 237
Location: Birmingham
I have a middleburn crank setup on my IFT 97, I'm buggered if I want to pay 40 quid everytime my outer chainring goes but I'm having trouble finding a cheap replacement for it.
I have measured the bolt to bolt and it's 90mm I think the cranks are MB RS3's. There doesn;t seem to be a 90mm chainring around (unless I'm screwing something up)
Anyone help??


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PostPosted: Sun Feb 17, 2013 4:45 pm 
Retro Guru
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Joined: Sun Mar 14, 2010 2:33 am
Posts: 2934
Location: daaan saaaf
Here's how you measure and a chart with BCDs: http://www.bikeman.com/bicycle-repair-tech-info/bikeman-tech-info/1628-chainring-bcd.

90mm doesn't sound right. :? 110mm BCD is common for 5 bolt MTB cranks, 104mm for 4 bolt.


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PostPosted: Sun Feb 17, 2013 4:55 pm 
Old School Hero

Joined: Sun Aug 08, 2010 11:35 am
Posts: 237
Location: Birmingham
thx i will check it out


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PostPosted: Sun Feb 17, 2013 5:51 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 5660
Location: Aberdeen
isn't the Middleburn crankset worthy of a decent chainring though? I can't imagine the outer ring will wear all that quickly?


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PostPosted: Sun Feb 17, 2013 6:54 pm 
Old School Hero

Joined: Sun Aug 08, 2010 11:35 am
Posts: 237
Location: Birmingham
jimo746 wrote:
isn't the Middleburn crankset worthy of a decent chainring though? I can't imagine the outer ring will wear all that quickly?



No I spend most of the time in the outer ring and to be honest the last MBurn outers I got lasted 4 months so really for the price they were shit. I need some cheapish 94mm 5 bolt 44/46t chainrings. I have looked at all the usual places and nobody seems to sell them anymore or if they do I can't see them.

Anyone know where I can get these from.


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PostPosted: Sun Feb 17, 2013 7:05 pm 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 16749
Location: Yorkshire, England
Chainreactioncycles will have a few styles in, but you often need to go through them.
Also SpaCycles crops up a lot


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PostPosted: Sun Feb 17, 2013 7:11 pm 
Retro Guru

Joined: Tue Dec 04, 2012 6:15 pm
Posts: 523
Would you be better buying a new spider from middleburn so you can run el-cheap steel rings? More expense up front but should save you money in the long run.


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PostPosted: Sun Feb 17, 2013 7:14 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 5660
Location: Aberdeen
Signal11th wrote:
No I spend most of the time in the outer ring and to be honest the last MBurn outers I got lasted 4 months so really for the price they were shit.


when you put it like that, £40 every 4 months is a bit steep :shock:

http://www.ebay.co.uk/itm/BBB-5-Bolt-Allow-Chain-Ring-44t-94-BCD-/251214432279?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3a7d8c0817

worthwhile trawling through the CRC site as well.


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PostPosted: Sun Feb 17, 2013 7:36 pm 
Retro Guru
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Joined: Sun Mar 14, 2010 2:33 am
Posts: 2934
Location: daaan saaaf
Have you considered changing the spider for one with a more common BCD: http://www.chainreactioncycles.com/Models.aspx?ModelID=7056&utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom

This would give you a more choice of chainrings, Surly for example, do stainless steel rings which should last longer than alluminium: http://www.ukbikestore.co.uk/product/54/crsu10/surly-stainless-steel-chainring-110bcd-5-arm.html and Stronglight have a selection of 104 and 110 BCD rings: http://www.spacycles.co.uk/products.php?plid=m2b2s149p0


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PostPosted: Sun Feb 17, 2013 8:02 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6980
Location: Bristle
where are you riding that you spend all of your time on the big dog?


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