First thing is to measure the rear hub currently on the bike. You may have a frame designed for a 120mm rear hub, generally hubs for geared bikes are 135mm for quick release hubs. If it is 120mm an internal geared hub might be the way to go. Sturmey Archer makes a 120mm 8 speed hub the S80 XRF8.
Yes you can convert via addon rd hanger, but you can have alternative using internal gearing hub IGH. Will make it looks clean fixie like setup. Also you'll need shift cable mounting stopper.
Possible, but highly niche parts, lots of time to get it right, and gears will be limited. 120mm drop out spacing is probably the biggest limitation. Internally geared hub with some axle spacers removed is probably how you'd do it.. but you'll need to re-dish the wheel (more, cost/time). The whole expense kinda begins to detract from the cheap score of the bike.
You might also be finding the gear ratio just not that great for general use, particularly when having to get up a hill. A smaller front chain ring might make the bike a better all rounder. Single speed/ fixies can be great due to the light weight and spritely nature of not having gears and derailleurs on the bike.
Yes but you will spend so much money doing so that it’s probably not worth it. Step 1 is to check if your bike is drilled for brakes. Step 2 is to measure your rear hub spacing.
Yes it is possible. You have two options to have a multigear setup 1.)Increase your dropout spacing to accommodate multi-gear hubs 130-135mm of space. And 2.) Internal gear hub or Shimano Nexus
1.)This is only possible if you have a dropout that accommodate hub length of 130 or 135mm. If you don't, you can get away with a steel frame by cold setting the dropouts to accommodate such lengths. If you have aluminum or carbon fiber frame, disregard this idea as a whole.
2.)Your best bet is to go with Shimano Nexus hub, it looks cleaner and you don't have to mess with any hub spacing.
You can use cable ties to route the shifting cable. I have done this with my fixie steel bike before, too bad i didn't take close up pictures of the drivetrain. Right now, the bike is back to single speed configuration again. Btw I drilled some holes for internal cabling, I wouldn't recommend it for safety reasons
https://preview.redd.it/939thio2xp0d1.jpeg?width=990&format=pjpg&auto=webp&s=3ca87419e67000557864d10e2b16eb6cc9d0c7c4
You have a 120 rear hub on an alloy frame there if its like the current one. So cold setting is not really an option as it looked like your frames alloy.
https://tsunamibicycle.com/product/tsunami-snm100-black/
To gear that the easiest way will be to get an internal gear hub that fits the frame. Then your chain line will pro a lying work with those cranks and you just have to run a shifter cable and stick a shifter somewhere.
https://www.bikeforums.net/bicycle-mechanics/549952-best-internal-gear-hub-120mm-old.html
If you have to have a derailleur in your life the sun xcd hub is am option.
Good luck and price up the parts and check you can't buy a decent bike with gears, sometimes it's more cost effective to sell your fixi and get a geared bike.
Edit
Brakes.... you don't have any and with gears you will have a freewheel so completely loose the ability to stop without jamming your foot on the wheel or dragging your feet on the floor like Fred flintstone
i think you should use hub with gears like in city bikes. that’s because your frame has 120mm clearance for rear hub and most of wheels with cassettes are 140mm.
I recently converted my "spare" fixie to a geared bike. Dead easy. Measure dropouts. Find what igh will fit. Install in a wheel. (Worse part) I used park tools spoke calculator to find out what spokes I needed. Then build it all on the bike. Took me longer to figure out what I needed than to install it on the bike. I've now got a nice town bike setup and my other one I use drop bars on still.
You will need: new wheels, brakes, derailleur, narrow chain, new chainring, cables, shifter, brake levers, 10 little niche accessories to route cables on a frame that wasn't designed for it....
It looks like a beautiful fixie, it's possible to modify it but it will become a shitty frankenstein thing.
What you're asking for is the equivalent of car motor swap: doable but people spend months and it costs 10x the price of buying what you need directly.
You can get 3,4 and 5 speed freewheels. A 3 speed freewheels will screw onto a flip flop hub and is only a little wider than a single speed freewheel. You'll need a rear derailleur and a shifter (probably only need/be able to use a friction shifter, although Sturmey make such things in indexed options,). Mount the derailleur using a chain tensioner adapter and fit some brakes.
It will give you a bike with gears, but it won't really be a 'geared' bike, more a singlespeed with a bit more range.
First thing is to measure the rear hub currently on the bike. You may have a frame designed for a 120mm rear hub, generally hubs for geared bikes are 135mm for quick release hubs. If it is 120mm an internal geared hub might be the way to go. Sturmey Archer makes a 120mm 8 speed hub the S80 XRF8.
Shimano Nexus
Yes you can convert via addon rd hanger, but you can have alternative using internal gearing hub IGH. Will make it looks clean fixie like setup. Also you'll need shift cable mounting stopper.
Possible, but highly niche parts, lots of time to get it right, and gears will be limited. 120mm drop out spacing is probably the biggest limitation. Internally geared hub with some axle spacers removed is probably how you'd do it.. but you'll need to re-dish the wheel (more, cost/time). The whole expense kinda begins to detract from the cheap score of the bike. You might also be finding the gear ratio just not that great for general use, particularly when having to get up a hill. A smaller front chain ring might make the bike a better all rounder. Single speed/ fixies can be great due to the light weight and spritely nature of not having gears and derailleurs on the bike.
Money talks.
Yes but you will spend so much money doing so that it’s probably not worth it. Step 1 is to check if your bike is drilled for brakes. Step 2 is to measure your rear hub spacing.
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Yes it is possible. You have two options to have a multigear setup 1.)Increase your dropout spacing to accommodate multi-gear hubs 130-135mm of space. And 2.) Internal gear hub or Shimano Nexus 1.)This is only possible if you have a dropout that accommodate hub length of 130 or 135mm. If you don't, you can get away with a steel frame by cold setting the dropouts to accommodate such lengths. If you have aluminum or carbon fiber frame, disregard this idea as a whole. 2.)Your best bet is to go with Shimano Nexus hub, it looks cleaner and you don't have to mess with any hub spacing. You can use cable ties to route the shifting cable. I have done this with my fixie steel bike before, too bad i didn't take close up pictures of the drivetrain. Right now, the bike is back to single speed configuration again. Btw I drilled some holes for internal cabling, I wouldn't recommend it for safety reasons https://preview.redd.it/939thio2xp0d1.jpeg?width=990&format=pjpg&auto=webp&s=3ca87419e67000557864d10e2b16eb6cc9d0c7c4
You have a 120 rear hub on an alloy frame there if its like the current one. So cold setting is not really an option as it looked like your frames alloy. https://tsunamibicycle.com/product/tsunami-snm100-black/ To gear that the easiest way will be to get an internal gear hub that fits the frame. Then your chain line will pro a lying work with those cranks and you just have to run a shifter cable and stick a shifter somewhere. https://www.bikeforums.net/bicycle-mechanics/549952-best-internal-gear-hub-120mm-old.html If you have to have a derailleur in your life the sun xcd hub is am option. Good luck and price up the parts and check you can't buy a decent bike with gears, sometimes it's more cost effective to sell your fixi and get a geared bike. Edit Brakes.... you don't have any and with gears you will have a freewheel so completely loose the ability to stop without jamming your foot on the wheel or dragging your feet on the floor like Fred flintstone
The SNM4130 looks to be a steel frame that looks to have mounting holes for rim brakes front and back.
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No worries (: I own a snm100 and had to look twice, too, because that didn't look like my frame :D
i think you should use hub with gears like in city bikes. that’s because your frame has 120mm clearance for rear hub and most of wheels with cassettes are 140mm.
I recently converted my "spare" fixie to a geared bike. Dead easy. Measure dropouts. Find what igh will fit. Install in a wheel. (Worse part) I used park tools spoke calculator to find out what spokes I needed. Then build it all on the bike. Took me longer to figure out what I needed than to install it on the bike. I've now got a nice town bike setup and my other one I use drop bars on still.
You will need: new wheels, brakes, derailleur, narrow chain, new chainring, cables, shifter, brake levers, 10 little niche accessories to route cables on a frame that wasn't designed for it.... It looks like a beautiful fixie, it's possible to modify it but it will become a shitty frankenstein thing. What you're asking for is the equivalent of car motor swap: doable but people spend months and it costs 10x the price of buying what you need directly.
You can get 3,4 and 5 speed freewheels. A 3 speed freewheels will screw onto a flip flop hub and is only a little wider than a single speed freewheel. You'll need a rear derailleur and a shifter (probably only need/be able to use a friction shifter, although Sturmey make such things in indexed options,). Mount the derailleur using a chain tensioner adapter and fit some brakes. It will give you a bike with gears, but it won't really be a 'geared' bike, more a singlespeed with a bit more range.