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Old 09-07-17, 09:52 PM   #1
grooveboy
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More than 21 speeds ?

Hi guys my name is grooveboy.
When I was a kid we would build bikes from whatever we found in the hood and I remember building a 15 speed bike once back in the late seventies.

Now I just bought a used 21 speed mountain bike that I want to kind of customize and wanted to know is there such a bike or a series of parts to allow me to build one past 21 speeds and if there is, what is the highest speed bike, or I would guess the largest geared bike that I could build ?

Thanks
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Old 09-07-17, 11:20 PM   #2
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Welcome, Grooveboy. The only way you will be able to get more speeds is to change your rear end. Bikes have been made with 8, 9, 10, and 11 gear cassettes for a few decades now. The issue for you is whether they will fit inside the bike's rear triangle. If you have access to a suitable measuring tool (micrometer is best), measure inside the rear wheel dropouts.

If the measurement is 130 mm or more, you can fit more than 7 gears. Then you'll need to determine if your rear wheel can handle a cassette with more than 7 speeds. If it can, THEN you will need to get a new rear derailleur and shifter that matches the number of gears you choose. If it cannot take more than 7 speeds, you'll need a new hub and spokes at the least, or a new wheel.

If your frame width is less than 130 mm (more or less . . . It is possible to wrestle a 130mm hub into a 128-129 mm space) you can take it to a shop to have it bent out to 130mm. And then go ahead with the other steps to get more speeds on your bike.
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Old 09-08-17, 08:51 AM   #3
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test, just wrote a long answer but got logged off during it. aggravating.
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Old 09-08-17, 08:54 AM   #4
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SRAM Dual Drive hub (3 speed internal) fitted with a 9-speed cassette and a front triple will give you 81 absurdly closely spaced gears.
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Old 09-08-17, 11:53 AM   #5
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How many do you want? If you got a triple with a Mountain Tamer ring, and put an 11-speed cassette on a SRAM Dual Drive hub*, that would give 132 gears with probably tons of overlap, if my math is right.

* Not sure if this is possible, but they do make one that can take a 10-speed cassette.
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There's no such thing as too far.. just lack of time
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Old 09-08-17, 12:46 PM   #6
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Originally Posted by ThermionicScott View Post
How many do you want? If you got a triple with a Mountain Tamer ring, and put an 11-speed cassette on a SRAM Dual Drive hub*, that would give 132 gears with probably tons of overlap, if my math is right.

* Not sure if this is possible, but they do make one that can take a 10-speed cassette.
...then add a Schlumpf geared crankset to that....
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Old 09-08-17, 01:24 PM   #7
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the hybridization of a cassette driver on the end of a 3 speed internal gear hub,IGH from Sturmey Archer will be 3x 8, or 9 speeds depending on your cassette choice

there is the potential to put another IGH, with a sprocket attached to the hub shell ** to have a chain down to the rear hub, with the hub up sat the top of the seatstay/seat tube joint, this requires a bit of frame builder type bodging..

then the chain from the crankset , which has 3 or maybe 4 chainrings, goes up to the cog on the 2nd IGH,
which turns the 2nd hub shell cog , that chain,

which in turn turns the gears in the back wheel..

** those hubs are made to go in adult trikes, to have 3 speeds ...

1957 I got a 3 cog cluster for my AW3 IGH, and a triple crank, so 3x3x3 or 3 cubed gives 27 'speeds'.







...

Last edited by fietsbob; 09-08-17 at 01:27 PM.
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Old 09-09-17, 01:54 PM   #8
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Originally Posted by fietsbob View Post
the hybridization of a cassette driver on the end of a 3 speed internal gear hub,IGH from Sturmey Archer will be 3x 8, or 9 speeds depending on your cassette choice

there is the potential to put another IGH, with a sprocket attached to the hub shell ** to have a chain down to the rear hub, with the hub up sat the top of the seatstay/seat tube joint, this requires a bit of frame builder type bodging..


...
I hate that this forum randomly logs me off. this is what I was thinking (I love a weird bike and was thinking of a crazy burrito/stretch cruiser with gears all over it), like a trike hub mid-drive, along with the sram dual-drive. you'd need an idler at the trike hub mounting point too, to allow a triple chainring up front.. also, it would take a bike that uses a one piece crank, and some creativity, but you could look for a dana 3 speed front crank set up. it only has one chain ring, but maybe you could work out how to make it a double or triple.
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Old 09-09-17, 02:34 PM   #9
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Look at John Howard and Fred Romplelburg's Motor paced speed record bikes for examples of how counter shafts
and 2 or 3 stage gear advantage, let them ride at over 150mph once the wind/air was pushed aside by a petrol fueled race car..
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Old 09-13-17, 09:06 AM   #10
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1 NuVinci CVR hub out of the wheel, driven by the cranks, Driving a 2nd NuVinci CVR in the rear wheel, could give you double infinity gears
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Old 09-15-17, 03:28 PM   #11
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Now all you need is to figure out where to stick the FLUX capacitor.You can have some crazy off the wall TIME TRAVEL.Then you'd have to figure out how many LIFEPO4 cells to attain the maximum JIGGER WATTS....... but seriously i like your idea.Nothing like being different.Now you got me thinking.lol
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Old 09-22-17, 07:38 AM   #12
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My bike have 28 speeds. I love her. =)
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