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I just purchased a 2001 Giant NRS3 although I am enjoying it, it is having troubles bouncing back and forth between gears at times, so I am working on purchasing what I need to swap it to 1x10. Right now my range is 0.6875 to 4 my old hybrid was 0.8571 to 3.8181. With a 34t chainring and 11-36t I get 0.9444 to 3.0909 . With a 36t chainring and 11-36t I get 1 to 3.2727 . If I could get even a 10t cog my range could be 0.9444 to 3.4 with 34t chaingring or 1 to 3.6 with a 36t chainring If I could get a 9t cog it would open up to even better ratios allowing me to have more versatility between mountain riding and touring on roads doing long distance rides. Am I worried too much about the ratio loss from 3.8181 down to 3.2727 or 3.0909?
 

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You can't go either 10t or 9t without a special hub or at least freehub body. For 9t you'll need a capreo style freehub/hub and something like a Recon 9-36t cassette or DIY using a capreo cassette and 10spd 11-36 cassette with some machining. For 10t you'll need to go to 11 speed with an xD freehub and XX1 or XX0 11 speed cassette. Your other option to get more range is to add an aftermarket 40 or 42t rear sprocket to your cassette, but the ratios are not going to be as evenly spaced as XX1 11 speed or 9-36t recon.
 

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You can't go either 10t or 9t without a special hub or at least freehub body. For 9t you'll need a capreo style freehub/hub and something like a Recon 9-36t cassette or DIY using a capreo cassette and 10spd 11-36 cassette with some machining. For 10t you'll need to go to 11 speed with an xD freehub and XX1 or XX0 11 speed cassette. Your other option to get more range is to add an aftermarket 40 or 42t rear sprocket to your cassette, but the ratios are not going to be as evenly spaced as XX1 11 speed or 9-36t recon.
With capreo you can also go Canfield bro micro drive.

if you want to go 9t with xd driver you could go with a Leonardi 10sp cassette.

Back ot, the latest xt/xtr shifts flawlessly up front, what is and how old is your current chainrings and front derailleur. Road touring + mtn biking + 1x really don't mix. You should go to a LBS and demo a 1x 2x 3x system to really see what you are giving up.
 

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I just purchased a 2001 Giant NRS3 although I am enjoying it, it is having troubles bouncing back and forth between gears at times, so I am working on purchasing what I need to swap it to 1x10. Right now my range is 0.6875 to 4 my old hybrid was 0.8571 to 3.8181. With a 34t chainring and 11-36t I get 0.9444 to 3.0909 . With a 36t chainring and 11-36t I get 1 to 3.2727 . If I could get even a 10t cog my range could be 0.9444 to 3.4 with 34t chaingring or 1 to 3.6 with a 36t chainring If I could get a 9t cog it would open up to even better ratios allowing me to have more versatility between mountain riding and touring on roads doing long distance rides. Am I worried too much about the ratio loss from 3.8181 down to 3.2727 or 3.0909?

I enterpret "bouncing back and forth" as something thats not adjusted very well, and only that.

Also when going to smaller cogs the efficency gets worse, 9 and 10 are more inefficient than 11 and 12 and so on. So even if you could get a 9 on there you got to ask yourself if its actually worth it and will it actually provide anything more than what you already have. in practice that is. The smaller the cogs the faster they wear out too.

First option would be exploring 9sp 1x and second one 10sp 1x and see what you can build with those. 11sp gets really expensive really fast.

Also the 10 and 11sp stuff is thinner and most likely weaker and faster wearing than 9sp.

Running an 11-36 cass with your choice up front is not that bad I think. I think the difference would be minimal with a 10 on there or a 40t cog, even though it might look like much in numbers. Its 10% either way, its nothing when on the bike imho. Personally I wouldn't spend any money on it at all.
 
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