M900 uses 520 chain. I looked into using a 525 as mine has munched up sprockets (Monster Munch!) but couldn't find a 525 rear sprocket to fit. Fronts are available as the same type (in 525) are used on 916/996.
I originally used a Renthal, hard anodised alloy rear but got through 2 in 2 years (maybe 2-2,500 miles each) so I swapped to a supersprox which is supposed to be the dog's danglies but even that was finished after less than 5,000 miles.
I have just replaced the whole set again (JT front, DiD 'x' ring chain, Supersprox rear) so I'll see how it goes this time...
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M900, 916, LeMans II.
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