can 2 casettes be combined into one?
#1
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can 2 casettes be combined into one?
(accidentally posted on the road bike forum first... mods can delete that post)
I have a SunTour cassette I just bought off of evilbay to put on my Trek 400, which is already equipped with a badly geared SunTour cassette...
What I have now is 14, 16, 19, 23, 27, and 30.. The 27 and 30 are totally useless.
The one i just bought has 13, 14, 15, 16, 17, 19, and 22... (one's a 6 speed, the other 7.. the spacing is the same between the cogs, as are the guts, from what I'm told.)
If I could make my own, I would do the 13, 14, 16, 17, 19, 22, and 23- or, maybe the 27 for in case I need to climb something...
here's how the gear ratios would end up, plus cadence at 17.5 mph...
13 14 15 16 17 19 22 (or 27)
52 4.00 3.71 3.47 3.25 3.06 2.74 2.36 (1.93)
56.0 60.3 64.6 68.9 73.2 81.8 94.7 (116.3)
40 3.08 2.86 2.67 2.50 2.35 2.11 1.82 (1.48)
72.8 78.4 84.0 89.6 95.2 106.4 123.1 (151.1)
now, on the bike the way it is now, the ratios and cadence look like this:
14 16 19 23 27 30
52 3.71 3.25 2.74 2.26 1.93 1.73
60.3 68.9 81.8 99.0 116.3 129.2
40 2.86 2.50 2.11 1.74 1.48 1.33
78.4 89.6 106.4 128.7 151.1 167.9
To me, this would make the bike more useable at the speeds I'm able to go right now, for much less than the $750+ for a new bike...
Can casettes be safely taken apart and remade, or is this an exercise in "what if's"...
I have a SunTour cassette I just bought off of evilbay to put on my Trek 400, which is already equipped with a badly geared SunTour cassette...
What I have now is 14, 16, 19, 23, 27, and 30.. The 27 and 30 are totally useless.
The one i just bought has 13, 14, 15, 16, 17, 19, and 22... (one's a 6 speed, the other 7.. the spacing is the same between the cogs, as are the guts, from what I'm told.)
If I could make my own, I would do the 13, 14, 16, 17, 19, 22, and 23- or, maybe the 27 for in case I need to climb something...
here's how the gear ratios would end up, plus cadence at 17.5 mph...
13 14 15 16 17 19 22 (or 27)
52 4.00 3.71 3.47 3.25 3.06 2.74 2.36 (1.93)
56.0 60.3 64.6 68.9 73.2 81.8 94.7 (116.3)
40 3.08 2.86 2.67 2.50 2.35 2.11 1.82 (1.48)
72.8 78.4 84.0 89.6 95.2 106.4 123.1 (151.1)
now, on the bike the way it is now, the ratios and cadence look like this:
14 16 19 23 27 30
52 3.71 3.25 2.74 2.26 1.93 1.73
60.3 68.9 81.8 99.0 116.3 129.2
40 2.86 2.50 2.11 1.74 1.48 1.33
78.4 89.6 106.4 128.7 151.1 167.9
To me, this would make the bike more useable at the speeds I'm able to go right now, for much less than the $750+ for a new bike...
Can casettes be safely taken apart and remade, or is this an exercise in "what if's"...
#2
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the short answer is... yes.
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Originally Posted by steaktaco
the short answer is... yes.
#4
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it's freewheels... (i'm a noob, still learning)
Someone said tht the 6 speed and the 7 speed freewheels are the same, except the 7 speed has a double cog for the two small one, and that's what I have.
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
Someone said tht the 6 speed and the 7 speed freewheels are the same, except the 7 speed has a double cog for the two small one, and that's what I have.
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
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Originally Posted by soni_guin
it's freewheels...
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
#6
Senior Member
Originally Posted by soni_guin
it's freewheels... (i'm a noob, still learning)
Someone said tht the 6 speed and the 7 speed freewheels are the same, except the 7 speed has a double cog for the two small one, and that's what I have.
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
Someone said tht the 6 speed and the 7 speed freewheels are the same, except the 7 speed has a double cog for the two small one, and that's what I have.
i need to figure out how the freewheel comes apart so I can change gears around and make what I want...
Be very, very careful with the order of the spacers when you take them off. The Suntour system uses fairly linear cable pulls from the shifter. This results in uneven lateral movements of the rear-derailleur and requries teh distance between each and every cog be different. The spacing varies from 3.1 to 3.6mm between the cogs so don't get the order of the spacers mixed up!
Also on the Ultra-7 freewheels, there's two types of small double cogs. There's a one-piece one with two gears, I think it's the 13/14th combo. Then there's another one with a 13t 2nd gear and a spin-on 12t 1st cog that spins onto that 2nd cog. Use the chain-whip to remove the outermost/smallest cog first. Then if that one comes off by itself only, you got the 2-piece one so use the chain-whip again to remove that 2nd cog.
Note also that the gears are stamped, so there's a bevel on one side of all the edges with a sharp 90-degree edge on the opposite side. Re-install your gears so that the beveled sides face the same direction as the original cogs.
Last edited by DannoXYZ; 09-18-05 at 03:11 AM.