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Stangely difficult to find a specific chainring.

Old 04-09-20, 07:42 PM
  #1  
milktin
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Stangely difficult to find a specific chainring.

I've been building up a touring bike recently, and am going for a drive train with either: 40/24T chainrings and 11-36T 9 speed cassette, or 38T chainrings and 11-34T 8 speed cassette. This seems like a simple way of getting a good range for heavy touring of a about 18-95 gear inches, with about a 15% jump per cog.

I've just had one problem. I can't for the life of me find an appropriate larger chainring! All of the 38-40T chainrings I find all are for 1x setups.

I have two options of cranks, so I need one of the following two chainrings:
5 bolt, 110bcd, 40T (or 39T) 9 speed compatible chainring
or
4 bolt, 104bcd, 38T (or 39T) 8 speed compatible chainring

Am I just looking in the wrong places?! I thought these would be simple enough items to find, but have had no luck.

Thanks!
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Old 04-09-20, 08:04 PM
  #2  
darkhorse75
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https://www.wiggle.co.uk/ta-110-pcd-...inring-40-49t/
https://www.wiggle.co.uk/blackspire-...o-xtr-fc-m980/
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Old 04-10-20, 08:06 AM
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wesmamyke 
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40t outer actually meant for shifting: https://www.ebay.com/itm/Sugino-PE11...4AAOSwvpZee7Af

Way more expensive option: https://www.ebay.com/itm/Interloc-Ra...UAAOSwtkheX5UO
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Old 04-10-20, 10:00 AM
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dsbrantjr
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Or put a triple up front with a more-moderate cassette for closer jumps between cogs.
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Old 04-10-20, 05:31 PM
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Trevtassie
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Just to add some confusion, Sunrace do an 11-40T 9 speed cassette as well... And Shimano have a 22, 30, 40 triple crankset. You can also buy the 40T ring as a separate item, though it is steel.
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Old 04-10-20, 06:07 PM
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caloso
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The TA chainring is excellent. I put a 44t outer ring on my son's road bike as a cheaper, easier way to achieve junior gearing.
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Old 04-11-20, 02:05 AM
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What you're looking for kind of falls in the crack of recent mainstream gear--and to be honest, I kinda get why: what you want is not what I'd want (I would probably run a triple if I wanted a similarly low gear and relatively tight spacing). The closest recent, mainstream products would be some 10 speed era 42/28 cranks. Basically, in the mainstream <46t is considered not enough top end for gravel, and >38 is too high for mountain bikes (given that 26" is now rare), and the MTB cranksets have been trending to have smaller gaps to make shift sequences faster, particularly given that MTB cassettes have very wide range these days.

On modern drivetrains, the chainrings are shaped to shift fast with really pretty specific combinations. I get that for touring or endurance riding having exactly the gears you want may trump particularly fast front shifts. I'd probably try the TA rings if I wanted to get your setup.
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Old 04-11-20, 06:01 AM
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ted_major
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Have you looked at Rivendell or Rene Herse?

Riv has a 42/30 crankset and a 26-tooth granny ring in stock, and RH, while pricey, can do a 42/24. Not quite as low as you’re looking for, but close.
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Old 04-11-20, 03:42 PM
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White Industries is another great option and one I am spec'ing on an upcoming gravel/all road/bikepacking kinda build. You can pretty much do any combo you might want. Sugino also did this with their OX cranks and Rene Herse does it with Square taper if that is your jam.
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Old 04-12-20, 04:57 PM
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There seem to be multiple listings on eBay currently that meets your requirements.
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