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I have cranks with 4 holes for outer and middle rings attachment. There are no holed for inner ring attachment. On my other bikes crankset middlering has 8 holes 4 for cranks and 4 for inner ring. I tried to take them and attach to my other outer chainring and cranks and put it on bike, everything works perfect. The problem is I can't find middle chainring with 8 holes for sale in my country or on ebay. Should I drill 4 more holes on my crank. Or what should I do please advise!

Some IMGS:

I. My other middle chainring with 8 holes, I can't find it for sale:

http://i.stack.imgur.com/EsnRM.jpg

II. My crank inner side with 4 places for drilling maybe :D

http://i.stack.imgur.com/gWSiX.jpg

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    What brand cranks are you swapping parts from. – mikes Dec 19 '12 at 2:39
  • Wow I've never seen an inner attached to a middle like that. It does look like the 4 posts/blanks in the spider are exactly where you would usually find inner ring holes. As Mikes says, we need to know the chain set brand (or bike brand) – Mere Development Dec 19 '12 at 8:23
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I dont remember how did I connected here yesterday, so now I writing connected with gmail with my phone. Anyways, I took 32T attached to 22T from XCT SR SUNTOUR V3 22t,32t,42t crankset, I bought it from ebay, sorry cant give you the link now. Cranks with 4 holes only are FSA alphadrive. XCT also has 4 holes only on crank.

EDIT: cranks with middle chainring which has 8 holes.: http://www.ebay.co.uk/itm/280915668543?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

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