need help with Chainrings.

Signal11th · Feb 17, 2013

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??

xerxes · Feb 17, 2013

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.

Signal11th · Feb 17, 2013

thx i will check it out

jimo746 · Feb 17, 2013

isn't the Middleburn crankset worthy of a decent chainring though? I can't imagine the outer ring will wear all that quickly?

Signal11th · Feb 17, 2013

jimo746":3gw40nrv said:
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.

FluffyChicken · Feb 17, 2013

Chainreactioncycles will have a few styles in, but you often need to go through them.
Also SpaCycles crops up a lot

Rob H · Feb 17, 2013

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.

jimo746 · Feb 17, 2013

Signal11th":xfnculqx said:
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-Bol...sure_cycling_bikeparts_SR&hash=item3a7d8c0817

worthwhile trawling through the CRC site as well.

xerxes · Feb 17, 2013

Have you considered changing the spider for one with a more common BCD: http://www.chainreactioncycles.com/...le&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

cce · Feb 17, 2013

where are you riding that you spend all of your time on the big dog?

need help with Chainrings.

Signal11th

Retro Guru

xerxes

Old School Grand Master

Signal11th

Retro Guru

jimo746

Signal11th

Retro Guru

FluffyChicken

Rob H

Retro Guru

jimo746

xerxes

Old School Grand Master

cce

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