M900 cranks
- Thread starter spike3
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22 smallest and 46 tallest is pretty risky unless you know exactly what you're doing. That's a difference of 24T
You need to keep into account that the rear mech has a limited capability. For most long cage mechs it's 43T.
If you have a 24T difference between the extremes at the front, that leaves only 19T difference at the back (43-24=19).
Most cassettes however have a 21 or 23T difference, which would push your total to 45 or 47T, or more than a long cage mech can handle.
Sure, you could ride it perfectly fine, but if you aren't careful and put it on too extreme of a gear, you run the risk of destroying the mech.
You need to keep into account that the rear mech has a limited capability. For most long cage mechs it's 43T.
If you have a 24T difference between the extremes at the front, that leaves only 19T difference at the back (43-24=19).
Most cassettes however have a 21 or 23T difference, which would push your total to 45 or 47T, or more than a long cage mech can handle.
Sure, you could ride it perfectly fine, but if you aren't careful and put it on too extreme of a gear, you run the risk of destroying the mech.
halaburt
Retro Guru
M900 cranks are 5-bolt, 110/74 B.C.D. On a 74mm BCD, the smallest ring you'd be able to fit is a 24t. See: http://sheldonbrown.com/cribsheet-bcd.html
As for where to find chainrings, are you looking for genuine, period-correct Shimano rings? If so, you should look on eBay or similar and be prepared to pay quite a bit for NOS or near parts.
As for where to find chainrings, are you looking for genuine, period-correct Shimano rings? If so, you should look on eBay or similar and be prepared to pay quite a bit for NOS or near parts.
one-eyed_jim
Old School Grand Master
An Avid Microdapter 2 is legitimately retro, and lets you fit a 22t (or even a 20t) small ring to an M900 crank:halaburt":2b6lq70y said:
They pop up on eBay fairly frequently.
Genuine XTR rings are hard to come by, but there are many good alternatives on the market. I like Specialités TA. Ebay, the classifieds here, or a decent bike shop should give you a few options.spike3":2b6lq70y said:
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Full set of Middleburns here for example
http://www.chainreactioncycles.com/Kits ... delID=7072
or do a search on the many other 110BCD (or PCD) outer and middle rings and 74 innner rings.
Watch out for road compact 'inner' rings as they are designed for doubles.
http://www.chainreactioncycles.com/Kits ... delID=7072
or do a search on the many other 110BCD (or PCD) outer and middle rings and 74 innner rings.
Watch out for road compact 'inner' rings as they are designed for doubles.
