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AR15.COM
8/27/2026 3:27:30 PM EDT
I have a 3x7 Shimano Tourney set up.  I would like to go to a 1x as budget as possible.  Is it possible to swap out the chainring for a single and keep the rear 7?  I was originally going to change everything to a Deore, but if I can get away with just the front. I would like to do that.  Thanks
8/27/2026 4:39:41 PM EDT
[#1]
What crankset and bottom bracket do you have?  There should be some identifying numbers on the crankset somewhere and a photo may help with the bottom bracket if you don't know (or the bike's info & year).
8/27/2026 6:30:18 PM EDT
[#2]
bottom bracket      BP-VC73 cartridge
Crank Set                 Shimano FC-TY501 24/ 34/ 42 175mm Alloy
8/27/2026 9:57:55 PM EDT
[Last Edit: blwngazkit][Edited] [#3]
You have a square taper bottom bracket and crank set.

If you stick with the x7 rear cassette/freewheel your best bet is probably a Chinese replacement crankset and chain ring.

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Replacing the rear sprocket set is likely tl get complicated quickly involving your hub offsets and whether you have a freewheel or cassette style rear hub...


Bear in mind, a big reason 1x drivetrains are popular now is the wide range ratios options on the newer x10-12 rear cassettes.  By sticking with the existing 7 speed rear, you'll be losing quite a few options.   I've still done it though on some mild use bikes, it's just a trade off to keep in mind.
8/28/2026 6:05:08 AM EDT
[#4]
Thanks for that info.  I pretty much ride exclusively in the middle chainring, which is why I thought about going this route.  Otherwise, swapping everything out would really be worth it on a cheap bike.

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