Balooba Posted February 19, 2020 Share Need help please. I bought an Absolute Black 32t oval chainring. Trying to fit it on my XT M8000 but the holes are too small. The holes are threated (did not notice when I bought it). I believe this chainring was meant for the XT M785. The ring is not new. NOW- can I drill the holes to get rid of the tread. PS Spelling of "tread" I am not sure of. Link to comment Share on other sites More sharing options...
Shebeen Posted February 19, 2020 Share Need help please. I bought an Absolute Black 32t oval chainring. Trying to fit it on my XT M8000 but the holes are too small. The holes are threated (did not notice when I bought it). I believe this chainring was meant for the XT M785. The ring is not new. NOW- can I drill the holes to get rid of the tread. PS Spelling of "tread" I am not sure of. of course. it's not a porcelain doll. edit: you learn something new everyday Edited February 19, 2020 by Shebeen Link to comment Share on other sites More sharing options...
RobertWhitehead Posted February 19, 2020 Share Hang on a second before you grab the power tools. Those chain rings aren't threaded the thread is on the inside of the crank arm - do you mind posting a picture of the chain rings and holes? I have honestly never seen that the ring has a thread in it. Edit: I wanted to ask more questions What's the BCD of the ring? You get two different kinds - a 96 BCD which will be for the XT crank and then the older version, 104 BCD. Neither of which has a thread in them. In my view: A chain ring should not be drilled Need help please. I bought an Absolute Black 32t oval chainring. Trying to fit it on my XT M8000 but the holes are too small. The holes are threated (did not notice when I bought it). I believe this chainring was meant for the XT M785. The ring is not new. NOW- can I drill the holes to get rid of the tread. PS Spelling of "tread" I am not sure of. Edited February 19, 2020 by RobertWhitehead Balooba 1 Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share By the looks of it I did not buy myself an absolute black ring? Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share By the looks of it I did not buy myself an absolute black ring? And the guy I bought if from just confirmed it came of a XT 8000. Link to comment Share on other sites More sharing options...
DieselnDust Posted February 19, 2020 Share I've sen those rings . they are for 1x systems where you are converting a 2x crank to run 1x.the shoulder on the back provides a the correct spacing for the ring to get the chain line right. The thread is to make mounting easier. I would not drill it because you may have an extremely hard time finding chainring nuts that are the correct length to work with chainring bolts that are available. NOTE: I say may have trouble as I do not know the dimensions of the chainring nor the crank nor the mounting bolts and nuts you have available to you. Edited February 19, 2020 by DieselnDust Balooba and Dusty 2 Link to comment Share on other sites More sharing options...
DieselnDust Posted February 19, 2020 Share And the guy I bought if from just confirmed it came of a XT 8000. doesn't the XT 8000 have asymmetrical mounting holes because Shimano decided to stop you from buying generic rings optimise the mounting bolts to deliver 0.0001652782 W extra power. fanievb 1 Link to comment Share on other sites More sharing options...
Jewbacca Posted February 19, 2020 Share The 32 tooth AB oval rings are definitely threaded. DandD is correct, the XT8000 crank arms have a funny BCD so it looks like the chain ring is squinting when not mounted. yours looks like it should fit. You literally just line up the holes (the side with the 'triangle' protruding under the crank arm) and screw in the male chain ring bolt. DieselnDust and Captain Fastbastard Mayhem 2 Link to comment Share on other sites More sharing options...
RobertWhitehead Posted February 19, 2020 Share Found it: https://bike-addict.co.za/collections/chainrings-1/products/absolute-black-shimano-oval-chainring - its an XT ring. It should fit as per Jewbacca DieselnDust 1 Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted February 19, 2020 Share The 32 tooth AB oval rings are definitely threaded. DandD is correct, the XT8000 crank arms have a funny BCD so it looks like the chain ring is squinting when not mounted. yours looks like it should fit. You literally just line up the holes (the side with the 'triangle' protruding under the crank arm) and screw in the male chain ring bolt.This. You don't need the female bolt when fitting those threaded chainrings. Those protruding threaded bits locate into the back of the crank, in place of the female bolts. Eddy Gordo and DJR 2 Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share This. You don't need the female bolt when fitting those threaded chainrings. Those protruding threaded bits locate into the back of the crank, in place of the female bolts. The bolts I have (ones that came off the original chainring) do not fit into the oval chainring, they are too big. If I go smaller they do not fit into the crank??? Link to comment Share on other sites More sharing options...
DieselnDust Posted February 19, 2020 Share The bolts I have (ones that came off the original chainring) do not fit into the oval chainring, they are too big. If I go smaller they do not fit into the crank??? Can you measure with a vernier? Sometimes the thread start is a bit rough from the anodising.Typically all chain ring bolts are M8 x 0.75mm pitch Balooba 1 Link to comment Share on other sites More sharing options...
BaGearA Posted February 19, 2020 Share The bolts I have (ones that came off the original chainring) do not fit into the oval chainring, they are too big. If I go smaller they do not fit into the crank???Buy the correct bolts rather than drill g the ring.... Please Captain Fastbastard Mayhem, DJR and Balooba 3 Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share Found it: https://bike-addict.co.za/collections/chainrings-1/products/absolute-black-shimano-oval-chainring - its an XT ring. It should fit as per Jewbacca Mine is the 96BDC Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share Buy the correct bolts rather than drill g the ring.... Please Had the ring and crank at Solomons, they were also clueless as to what now... Link to comment Share on other sites More sharing options...
Balooba Posted February 19, 2020 Share Can you measure with a vernier? Sometimes the thread start is a bit rough from the anodising.Typically all chain ring bolts are M8 x 0.75mm pitch I do not own a Vernier but know someone. Will have him check. Link to comment Share on other sites More sharing options...
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