Compatibility issues when converting from 32t chainwheel to a 38t
03-10-23 | 11:21 PM
#1
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Joined: Mar 2023
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Compatibility issues when converting from 32t chainwheel to a 38t
Hey!
Recently upgraded my 3x8 beloved 20 year old aluminium hardtail to a 1x10, and now have a 50 mm chainline, with this setup:
Crank: Shimano Deore FC-M5100-1
Chain: Shimano CN-HG54
Cassette: Shimano Deore CS-M4100 (46)
BB: Shimano SM-BB52
Derailleur:Shimano Deore RD-M5120-SGS
Shifter: Shimano Deore SL-M4100
I miss the power of 3.23 & 3.82 ratio I had on the 3x and thought an upgrade to a 38 t would be great for a 3.45 ratio. (I hardly use the lowest gear anyway)
I'd appreciate a chainwheel recommendation that will fit the chain and crank I have.
Will the old bolts fit? or do I need to replace the as well?
Regards,
Ran
Recently upgraded my 3x8 beloved 20 year old aluminium hardtail to a 1x10, and now have a 50 mm chainline, with this setup:
Crank: Shimano Deore FC-M5100-1
Chain: Shimano CN-HG54
Cassette: Shimano Deore CS-M4100 (46)
BB: Shimano SM-BB52
Derailleur:Shimano Deore RD-M5120-SGS
Shifter: Shimano Deore SL-M4100
I miss the power of 3.23 & 3.82 ratio I had on the 3x and thought an upgrade to a 38 t would be great for a 3.45 ratio. (I hardly use the lowest gear anyway)
I'd appreciate a chainwheel recommendation that will fit the chain and crank I have.
Will the old bolts fit? or do I need to replace the as well?
Regards,
Ran
03-10-23 | 11:47 PM
#2
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Joined: Apr 2009
Posts: 39,897
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Last first. Chainring bolts are among the most standardized bike parts, so no issue there.
Rings with the same mount, ie. 5 bolt, and bolt circle will fit. There is some variance in offset, but not enough to fret over on a 1x system.
The only fly in your ointment MAY be whether the FD can be raised enough, or clear the curvature at the back. But you can deal with that IF it's an issue.
Rings with the same mount, ie. 5 bolt, and bolt circle will fit. There is some variance in offset, but not enough to fret over on a 1x system.
The only fly in your ointment MAY be whether the FD can be raised enough, or clear the curvature at the back. But you can deal with that IF it's an issue.
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Chain-L site
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
03-11-23 | 02:29 AM
#3
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Joined: Jul 2015
Posts: 7,494
Likes: 3,296
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
your chainring is an assymetric 4 bolt pattern, at 96mm BCD`...The Derailleur you listed will work with the 46 tooth cassette you listed, according to Shimano's specs, as will the HG-54 chain....I'll assume you mean a 38 Tooth Chainring... Remember that it's an ASSYMETRIC Bolt pattern. Here's a link that shows the odd bolt pattern's specs... https://www.ebay.com/itm/22351845440...3ABFBMkLK4_Nlh
