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Old 03-27-09, 02:57 PM   #1
joetronic
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3 speed (not internal)

Possible? Heres my thinking...

Disassemble an extra 7spd cassette
Choose the 3 cog range I want
Use spacers to bring cogs to outside of freewheel
Use triple front shifter, and set limit screws on 7spd der

input....??

Or is there a option that gives this already in production.

Why you say, well... I normally run SS, but sometimes I would like a lower gear for bombing DH or around town, and a little higher for those longer climbs. I run 38/18 now, but would like a little more and little less depending on the situation, but not all 7 cogs.

And to be honest, to be a little different. I know I could do the same with a tensioner, but have to get off the bike, loosen a bolt, move chain, and tighten bolt again. And my thinking is a der would help when the chainline is out a little when in the lower or higher gear. Chainline would be set for middle ring. If I'm crazy, or being stupid and making it harder than it needs to be just let me know. I also have all I would need already, just collecting dust.
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Old 03-27-09, 03:04 PM   #2
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If you're gonna use a 7spd shifter and have room for a 7spd cassette...why not just stay 7spd? The CK SS rear hub can somehow fit 6 cogs (customized to fit). I could see the benefit there b/c there's only room for 6 and you can get a dishless rear wheel that way.

But my feeling is that if you're using a standard freehub with a 7,8,9 speed shifter and a full range derailleur...what are you seriously gaining?


(there's a thread with a guy who did this on rbtm)
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Old 03-27-09, 03:10 PM   #3
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To be a little different, like the first post says. There's really no other reason.
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Old 03-27-09, 03:14 PM   #4
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Originally Posted by chelboed View Post
If you're gonna use a 7spd shifter and have room for a 7spd cassette...why not just stay 7spd? The CK SS rear hub can somehow fit 6 cogs (customized to fit). I could see the benefit there b/c there's only room for 6 and you can get a dishless rear wheel that way.

But my feeling is that if you're using a standard freehub with a 7,8,9 speed shifter and a full range derailleur...what are you seriously gaining?


(there's a thread with a guy who did this on rbtm)
Its not 7spd now, its SS. I don't need all 7, just a little more on the up and down then 38/18. I saw the CK, but I'm poor lol...

I know I'm not really going to gain anything over going full 7spd, but you know how sometimes you get an idea, and nothign less will do....

Do you have a link to the thread? Thanks for the reply
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Old 03-27-09, 03:46 PM   #5
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I'll see if I can find it and PM it to you. It is an interesting read and the OP has gotten it to work for him.
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Old 03-27-09, 04:08 PM   #6
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Quote:
Originally Posted by joetronic
3 speed (not internal) Is it possible?
Ha! you beat me to it!

I was thinking of doing the same thing. I've got a single speed hub with a very short barrel (about 18mm) and I thought there no reason why I can't place 3 cogs in there.




What I was thinking was a 3-speed with a large-ish ratio gap between them, probably a 24T - 18T - 14T for my intended use. Close ratios would be fine if you know where your sweet spot is... and changing ratios to whatever is easy anyway, it's not like it's permanent.

I'll be using a very short cage road bike derailleur (I've got an ultegra and a Tiagra lying around). The only 3 speed shifters I know of are commuter twist grip-shifters... if anybody knows of any trigger types, please let us know.

The only problem I can foresee is the cable pull of my twist shifter (Sturney Archer) may be for a 7 speed spacing... but I can machine wider spacers in between the cogs to rectify this if that's the case, but I have no idea what the shifting is going to be like.

There are some useful advantages:
Lighter weight in the sense that the chain will be shorter, shorter derailleur arm, and you'd only be carrying the cogs that you need... it's like having 3 single speed bikes all at the same time (well that's an oxymoron right there). A single speed hub also has wider spaced flanges, so the wheel spoke dish would be stronger. I'm pretty sure it'll be lighter than a 3 speed internal hub set-up... and I don't like the gangly shifter cable coming out of a "hollow" axle and sticking outside of the drop-out where stuff can hit it.

You actually don't need an advantage to do it, just because you want to is good enough I recon.

Let us know how yours turn out...


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Last edited by Pocko; 03-27-09 at 04:12 PM.
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Old 03-28-09, 12:35 PM   #7
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Well I decided to give it a try. What's the worst it could do right...

Details:
Sram 7spd cassette
Sram Sx4 derailure, 1:1
Shimano deore triple front shifter.


Ground down pins on cassette and chose the gears I want 22/18/15 and placed spacers(and a few ghetto spacers made of smaller cogs) to get chainline perfect in 18t. So far runs and shifts good. Only had a issue with the l tension screw not being long enough, but low and behold a screw off of a older 105 derailure is just the right length. No skipping, and no popping so far. Took on a 5 mile ride around town, then about a mile or so on some light singletrack (started to rain, DNR asked me to leave because it was getting muddy.) Most odd thing to get used to is shifting again. I've been on a SS or fixed for so long, it just feels weird. oh well. I must be gentel when shifter to 22, but thats will be fixed once I dial it all in better. I also think another 1/8" spacer between the cogs could help, but I'll have to wait till monday till I can fab some up at work

I know this is pointless. I could have just went the dingle route, but I love coming up for uses with my old junk, and I have no money, so I had to do it "ghetto fabulous" style. I appologize to the pics, crappy camera phone, crappy lighting





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Old 03-28-09, 02:14 PM   #8
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Weird...so you're using a Shimano 3spd "front" shifter with a 1:1 SRAM rear derailleur?
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Old 03-28-09, 02:16 PM   #9
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Quote:
Originally Posted by chelboed View Post
Weird...so you're using a 2:1 Shimano 3spd "front" shifter with a 1:1 SRAM rear derailleur?
Yup, and the the weirder thing is it works perfect *knocks on wood*
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Old 03-28-09, 02:19 PM   #10
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So a front shifter/derailleur is 1:1 ratio?
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Old 03-28-09, 06:12 PM   #11
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Originally Posted by joetronic View Post
Well I decided to give it a try. What's the worst it could do right...

Details:
Sram 7spd cassette
Sram Sx4 derailure, 1:1
Shimano deore triple front shifter.


Ground down pins on cassette and chose the gears I want 22/18/15 and placed spacers(and a few ghetto spacers made of smaller cogs) to get chainline perfect in 18t. So far runs and shifts good. Only had a issue with the l tension screw not being long enough, but low and behold a screw off of a older 105 derailure is just the right length. No skipping, and no popping so far. Took on a 5 mile ride around town, then about a mile or so on some light singletrack (started to rain, DNR asked me to leave because it was getting muddy.) Most odd thing to get used to is shifting again. I've been on a SS or fixed for so long, it just feels weird. oh well. I must be gentel when shifter to 22, but thats will be fixed once I dial it all in better. I also think another 1/8" spacer between the cogs could help, but I'll have to wait till monday till I can fab some up at work

I know this is pointless. I could have just went the dingle route, but I love coming up for uses with my old junk, and I have no money, so I had to do it "ghetto fabulous" style. I appologize to the pics, crappy camera phone, crappy lighting


The better question is what is that awesome hook thing you have holding your bike upright?
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Old 03-29-09, 12:02 AM   #12
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Well I decided to give it a try. What's the worst it could do right...

Most odd thing to get used to is shifting again...
GHETTOFABULOUS!!!

Awesome job joetronic... now looks like I gotta get my act together and sort my one out (might take a while as the frame I've got doesn't have a derailleur hangar, and I may have to fabricate one).

I would imagine that you would still use the bike like a single speed in a sense where you don't shift all the time like as in a 9speed cassette. My plan is to leave it pretty much in one gear most of the time but with three modes... climbing mode, flat-land mode and, downhill.

I was wondering if the stopper screw was going to be a problem, but looks like you sorted that one out too. Well done mate!



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Last edited by Pocko; 03-29-09 at 03:25 AM.
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Old 03-29-09, 12:09 AM   #13
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Originally Posted by chelboed View Post
Weird...so you're using a Shimano 3spd "front" shifter with a 1:1 SRAM rear derailleur?
In this case it wouldn't matter Chelboed... any 3-speed shifter will do because the 3 speed cog grouping is random stacked. The thickness of the spacers in between cogs can be varied to suit a 7 or 8 or 9 chain spacing depending on the shifter available.

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Old 03-29-09, 03:24 AM   #14
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I just had a dig and found all the parts I need.

Derailleur is an Ultegra but I couldn't find any model number on it. It's got a pretty short cage at 2" (50mm) c to c which is perfect.

I'm going for a 24-18-14T cog combination that's all set and ready to go. I was going to use a Sturney Archer 3 indent grip shifter as in the pic below, but I might try a front derailleur trigger type... ala what joetronic did, and hope it would work with the Ultegra. If the cable pull is too much, I might use 8speed cog spacers and pair it up with a wider 8 speed chain (that's if they're still available). Pity I can't try it out yet until I sort out my hanger.






Hey Joetronic just curious, which 3 cogs are you using in your set-up?



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Last edited by Pocko; 03-29-09 at 03:29 AM.
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Old 03-29-09, 06:18 AM   #15
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Pocko, Im using 22-18-15. I was gonna try 24-22-18, but 18 is my normal gear, and didn't want that on the outside, I wanted it to be the middle cog. And 15 would be nice when bombing around town. What I ended up doing with the spacing between the cogs is adding a 1/8" metal spacer along with the plastic one. This kept things quiet, and helped give the chain a little more room to move when in 15 since the chainline is a little off. when in that cog. I would try the trigger type, might work better with the ultegra. the tension screw was an easy fix, once I found one that was longer. Who new the 105 screw was a good 1/8" longer.

Still hard to get used to the sound the derailure makes when I jump it. Been on SS so long, its weird. Gonna see how long it holds up to the abuse I tend to give. May "get a little urban" on it later, so keep your fingers crossed.

What bike are you doing this to? Pics? maybe we can think up some ideas for the hanger


J-McKech: Its the "art of storage" bike rack. Very simple, and those little hooks move however you want. Great for bikes with sloping TT and FS bikes. I have a few of them. IMO better than the more expensive wood ones you see. And nice and cheap. 60$ at REI
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Old 03-29-09, 08:08 AM   #16
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The better question is what is that awesome hook thing you have holding your bike upright?
Here is a pick of the rack in my living room. Have two more in the "office" upstairs. Its nice to have the most rode at the time in the living room. My townhouse has very little storage area.



Works nice as a repair stand too.
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Old 03-30-09, 04:48 AM   #17
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what is the frame of the gray colored bike?

looks pretty cool...
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Old 03-30-09, 05:04 PM   #18
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what is the frame of the gray colored bike?

looks pretty cool...
'07 Fuji Panic Pro.
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Old 03-30-09, 05:11 PM   #19
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But what I want to know is if the bike actually plays with the cat-toy . . . or do you just leave it nearby for company?

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Old 03-30-09, 11:20 PM   #20
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'07 Fuji Panic Pro.
oxymoron |ˌksəˈmrˌn|
noun
a figure of speech in which apparently contradictory terms appear in conjunction (e.g., faith unfaithful kept him falsely true).

A "Panic Pro"?!?? Nice looking frame though

You mentioned earlier about derailleur (chain) sounds while jumping. I noticed from your pics that you might be able to shorten you chain a fair bit still. The tensioner arm flops from the weight of the chain at the bottom (non-tension) side of the chain stay. Decreasing that dead weight might help reduce chain-slap and the sound perhaps?


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Old 03-31-09, 05:02 AM   #21
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But what I want to know is if the bike actually plays with the cat-toy . . . or do you just leave it nearby for company?


Lol, no the cats don't,, but she does
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