SRAM S7 - how to block it in direct drive
03-06-08, 05:45 AM
#1
Sir Fallalot
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SRAM S7 - how to block it in direct drive
I have a SRAM S7 hub gear. I don't need the gears, and I want to get rid of the clickbox that protrudes laterally. I am interested in using it as a coaster brake hub.
So I am hoping there is a way to block the hub in direct drive (1st speed) and then not use the clickbox anymore. Any idea how this could be done?
So I am hoping there is a way to block the hub in direct drive (1st speed) and then not use the clickbox anymore. Any idea how this could be done?
03-06-08, 09:03 AM
#2
surly old man
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I do not have an answer for you, but isn't 4th gear the direct gear on it? I know it is on a Nexus, and I think I remember that it is on the Sachs/SRAM Spectro.
jim
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03-06-08, 09:32 AM
#3
Call me The Breeze
Here's my solution: Send me your hub, and I'll send you a SS coaster hub!
03-06-08, 11:43 PM
#4
Pwnerer
03-16-08, 12:02 PM
#6
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3.1
2.7
2.3
2.0
1.7
1.5
1.3
2.7
2.3
2.0
1.7
1.5
1.3
For your information, neither does the Nexus 8 have a direct drive gear. here are the gear ratios for the Nexus 8:
3.3
2.9
2.5
2.0
1.7
1.5
1.3
1.1
2.9
2.5
2.0
1.7
1.5
1.3
1.1
03-16-08, 07:08 PM
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No, direct drive on the SRAM S7 is #1. The Nexus 7 does not have a direct drive. These are the gear ratios for the Nexus 7:
For your information, neither does the Nexus 8 have a direct drive gear. here are the gear ratios for the Nexus 8:
3.1
2.7
2.3
2.0
1.7
1.5
1.3
2.7
2.3
2.0
1.7
1.5
1.3
For your information, neither does the Nexus 8 have a direct drive gear. here are the gear ratios for the Nexus 8:
3.3
2.9
2.5
2.0
1.7
1.5
1.3
1.1
2.9
2.5
2.0
1.7
1.5
1.3
1.1
Not sure where you got those numbers, but they are incorrect. Nexus 8 does have a 1 to 1 direct in 5th gear. Ratios are as follows.
8 -1.615:1
7 -1.419:1
6 -1.223:1
5 -1:1
4 -0.851:1
3 -0.748:1
2 -0.644:1
1 -0.527:1
Sram S7 is direct in 4th, not first.
7 -1:1.74
6 -1:1.48
5 -1:1.24
4 -1:1.000
3 -1:0.81
2 -1:0.68
1 -1:0.57
You are correct with regard to the Nexus 7, however, no direct. The only gearhub I am aware of with direct in 1st is the SA 8speed.
EDIT: Numbers for Nexus are output -input, Sram list is input to output. That's what can happen when you cut and paste.
Last edited by Dan Burkhart; 03-16-08 at 07:13 PM.
03-16-08, 08:31 PM
#8
Sir Fallalot
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Not sure where you got those numbers, but they are incorrect. Nexus 8 does have a 1 to 1 direct in 5th gear. Ratios are as follows.
8 -1.615:1
7 -1.419:1
6 -1.223:1
5 -1:1
4 -0.851:1
3 -0.748:1
2 -0.644:1
1 -0.527:1
Sram S7 is direct in 4th, not first.
7 -1:1.74
6 -1:1.48
5 -1:1.24
4 -1:1.000
3 -1:0.81
2 -1:0.68
1 -1:0.57
You are correct with regard to the Nexus 7, however, no direct. The only gearhub I am aware of with direct in 1st is the SA 8speed.
EDIT: Numbers for Nexus are output -input, Sram list is input to output. That's what can happen when you cut and paste.
8 -1.615:1
7 -1.419:1
6 -1.223:1
5 -1:1
4 -0.851:1
3 -0.748:1
2 -0.644:1
1 -0.527:1
Sram S7 is direct in 4th, not first.
7 -1:1.74
6 -1:1.48
5 -1:1.24
4 -1:1.000
3 -1:0.81
2 -1:0.68
1 -1:0.57
You are correct with regard to the Nexus 7, however, no direct. The only gearhub I am aware of with direct in 1st is the SA 8speed.
EDIT: Numbers for Nexus are output -input, Sram list is input to output. That's what can happen when you cut and paste.
03-16-08, 08:48 PM
#9
Call me The Breeze
How is this hub shifted? Is it a cable pull to engage a clutch?
03-16-08, 09:52 PM
#10
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At this address you can find two .PDF files that explain, somewhat, the operation of the hub:
https://www.sram24.com/newtechdoc/eng...s/srams7e.html
You can get a bit of info, for example, on page 10 of the second .PDF document. I am not sure what "clutch" means in the context of your sentence. The first of the two .PDF files seems to be somewhat informative, too.
https://www.sram24.com/newtechdoc/eng...s/srams7e.html
You can get a bit of info, for example, on page 10 of the second .PDF document. I am not sure what "clutch" means in the context of your sentence. The first of the two .PDF files seems to be somewhat informative, too.
03-16-08, 09:57 PM
#11
Senior Member
I have to say that I'm still at a loss for why you want to use a gear hub as a single speed setup. Why not just get a track bike wheel or a regular road/mountain wheel and use a single cog on the freehub? It'll be a lot lighter overall.
If you don't plan on going back to the gear hub sell off the wheel and shifter to finance the single speed conversion. In fact you'll have more money left over by far.
Or if you just want to try the single speed deal to see if this is for you then just pick a gear and ride it in that one gear until you decide if you like it or not.
If you don't plan on going back to the gear hub sell off the wheel and shifter to finance the single speed conversion. In fact you'll have more money left over by far.
Or if you just want to try the single speed deal to see if this is for you then just pick a gear and ride it in that one gear until you decide if you like it or not.
03-16-08, 10:34 PM
#12
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I wonder what would happen if I had the clickbox connected to the hub, shifted into #4 gear (direct drive) and removed the clickbox at that point. It doesn't seem like something SRAM would recommend, based on their documentation. Would I wreck the hub in some way? To be honest, I don't mind wrecking it if I would still maintain the direct drive, as the non-direct gears are of no use to me.
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
Last edited by wroomwroomoops; 03-16-08 at 10:47 PM.
03-16-08, 10:42 PM
#13
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I have to say that I'm still at a loss for why you want to use a gear hub as a single speed setup. Why not just get a track bike wheel or a regular road/mountain wheel and use a single cog on the freehub? It'll be a lot lighter overall.
If you don't plan on going back to the gear hub sell off the wheel and shifter to finance the single speed conversion. In fact you'll have more money left over by far.
Or if you just want to try the single speed deal to see if this is for you then just pick a gear and ride it in that one gear until you decide if you like it or not.
If you don't plan on going back to the gear hub sell off the wheel and shifter to finance the single speed conversion. In fact you'll have more money left over by far.
Or if you just want to try the single speed deal to see if this is for you then just pick a gear and ride it in that one gear until you decide if you like it or not.
03-17-08, 03:08 AM
#14
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I wonder what would happen if I had the clickbox connected to the hub, shifted into #4 gear (direct drive) and removed the clickbox at that point. It doesn't seem like something SRAM would recommend, based on their documentation. Would I wreck the hub in some way? To be honest, I don't mind wrecking it if I would still maintain the direct drive, as the non-direct gears are of no use to me.
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
If you remove the clickbox, the return spring in the hub will push out the shifter pins and you will be in seventh gear. If you want to block it in fourth, you would have to find a way to fix the inner and outher shifter pins in their corresponding position. Not easy.
03-17-08, 04:55 AM
#15
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Now, the return spring you mention: is it the one numbered (25) in the maintenance manual? (see attachment)
03-17-08, 07:41 AM
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I wonder what would happen if I had the clickbox connected to the hub, shifted into #4 gear (direct drive) and removed the clickbox at that point. It doesn't seem like something SRAM would recommend, based on their documentation. Would I wreck the hub in some way? To be honest, I don't mind wrecking it if I would still maintain the direct drive, as the non-direct gears are of no use to me.
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
I was even considering to remove all the planetary gears from the hub and just leave the coaster brake - which, I am speculating, should be encased separately aniway. But what I miss for such an attempt, is an exploded view of the internals (I think that's how this kind of diagram, where every part is visible, is called).
EDIT: I found the exploded view doc. It's located at
https://www.sram.com/en/service/sram/...nuals_2004.php
I'm sorry, I just don't have an answer for you with respect to locking it in 4th.
Ya know, single speed coaster brake hubs retail around 35 bucks.
03-17-08, 08:32 AM
#18
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If you remove the clickbox in 4th, or any gear other than first for that matter, the rod and outer sleeve, which shift the sun gears and select driver engagement between ring gear or planetary carrier respectively will simply spring out to their default position, meaning the hub will be in 1st gear.
I'm sorry, I just don't have an answer for you with respect to locking it in 4th.
Ya know, single speed coaster brake hubs retail around 35 bucks.
I'm sorry, I just don't have an answer for you with respect to locking it in 4th.
Ya know, single speed coaster brake hubs retail around 35 bucks.
I live in Finland. There's no way I can buy a singlespeed coaster brake hub for less than $120 with postage. EDIT: Sammyboy found a really cheap singlespeed hub in the UK.
OK, thanks. Good to know.
Last edited by wroomwroomoops; 03-17-08 at 09:50 AM.
03-17-08, 08:48 AM
#19
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There is one other hub that has direct drive on first, the Nexus 4. I don't think this is at all helpful in this situation, I mention it merely as a point of order......
Here, however, is an SS Coaster hub, £10 (15 Euros, $20). I'm sure you can order it from them for sensible shipping, but if not, I will happily order one and ship it to you, in exchange for your S7. To be honest, I'll do it just to be helpful, but I do have a use for a 7 speed hub:
https://www.sjscycles.co.uk/product-0...hole-12643.htm
Here, however, is an SS Coaster hub, £10 (15 Euros, $20). I'm sure you can order it from them for sensible shipping, but if not, I will happily order one and ship it to you, in exchange for your S7. To be honest, I'll do it just to be helpful, but I do have a use for a 7 speed hub:
https://www.sjscycles.co.uk/product-0...hole-12643.htm
03-17-08, 09:47 AM
#20
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There is one other hub that has direct drive on first, the Nexus 4. I don't think this is at all helpful in this situation, I mention it merely as a point of order......
Here, however, is an SS Coaster hub, £10 (15 Euros, $20). I'm sure you can order it from them for sensible shipping, but if not, I will happily order one and ship it to you, in exchange for your S7. To be honest, I'll do it just to be helpful, but I do have a use for a 7 speed hub:
https://www.sjscycles.co.uk/product-0...hole-12643.htm
Here, however, is an SS Coaster hub, £10 (15 Euros, $20). I'm sure you can order it from them for sensible shipping, but if not, I will happily order one and ship it to you, in exchange for your S7. To be honest, I'll do it just to be helpful, but I do have a use for a 7 speed hub:
https://www.sjscycles.co.uk/product-0...hole-12643.htm
And Sturmey-Archer sprockets are compatible with SRAM sprockets! Great, I don't need to order a sprocket!
Last edited by wroomwroomoops; 03-17-08 at 09:58 AM.
03-17-08, 11:54 AM
#21
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DARN! Sammyboy beat me to making you and offer to trade... 
04-01-08, 10:09 AM
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Now that I have an S7, I might have figured out a way to do this, but you'll need to keep the clickbox.
Use the shifter to shift into 4th gear, with the clickbox properly adjusted. Mark the position of the clickbox when in 4th gear.
Now, you'll need to anchor a shift cable to your frame and manually lock the clickbox in 4th gear using the marks you made previously.
Use the shifter to shift into 4th gear, with the clickbox properly adjusted. Mark the position of the clickbox when in 4th gear.
Now, you'll need to anchor a shift cable to your frame and manually lock the clickbox in 4th gear using the marks you made previously.
04-24-08, 01:49 PM
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I've figured out how to do this without the clickbox.
You'll have to use only the outer shift pin. By locking it in the "middle" position, you should be able to get 4th gear. You can experiment with this configuration by removing the middle shift pin, where you'll only get gears 1, 4, and 7 with the default clickbox and shifter.
You'll have to use only the outer shift pin. By locking it in the "middle" position, you should be able to get 4th gear. You can experiment with this configuration by removing the middle shift pin, where you'll only get gears 1, 4, and 7 with the default clickbox and shifter.
05-23-19, 12:34 AM
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K6-III, so actually pull out the middle pin? Is it easy to lock the outer pin. My clickbox, cable and handle is broken, so I want to lock in one of the middle gears (3 or 4). Tired of 1st.
05-23-19, 10:01 AM
#25
Banned
I'm still looking for a solution. One where I don't need the clickbox , would be preferred.
//...
Last edited by fietsbob; 05-23-19 at 10:05 AM.