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2 speed kickback without coaster brake and 3 speed cassette!!
2 speed kickback without coaster brake and 3 speed cassette!!
2 & 3 spd geared hub Pr0N!!
- Thread starter gogo
- Start date
mwkeefer
1 MW
3spd internal shifting with thread on freewheel ???? WTF - and the 2spd kicker looks well suited for reduction drive (using as a level of reduction) off the motor - or for use as a geared JackShaft.
Back in my days of Hot Rodding - we used to get upgrade kits for 700-R4 transmissions (new clutches, blue gears, new valve body mask, etc) which made them bullet proof to 500hp and 400ft lb of torque under demanding useage - couldn't we begin looking at the SA and other lines of internal shifting hubs with a similar perspective - trying to beef the innards up until they are strong enough for us (60ft lbs max I would think should do it, 80 ft lb @ 100A sounds right after reductions)
Can't wait for June!
-Mike
Back in my days of Hot Rodding - we used to get upgrade kits for 700-R4 transmissions (new clutches, blue gears, new valve body mask, etc) which made them bullet proof to 500hp and 400ft lb of torque under demanding useage - couldn't we begin looking at the SA and other lines of internal shifting hubs with a similar perspective - trying to beef the innards up until they are strong enough for us (60ft lbs max I would think should do it, 80 ft lb @ 100A sounds right after reductions)
Can't wait for June!
-Mike
Where does it say "thread on freewheel", Mike? I think it's just the Sturmey Archer equivalent of the SRAM Dual-Drive.
How are you going to change gear on the 2-speed, if it's used for a motor drive? Change the motor direction twice?
How are you going to change gear on the 2-speed, if it's used for a motor drive? Change the motor direction twice?
mwkeefer
1 MW
Miles,
I misread/interpreted the page linked above.... The one will accept any cassette (splined) the 2spd will handle a threadon but I guess your right about shifting the 2spd under power...
-Mike
I misread/interpreted the page linked above.... The one will accept any cassette (splined) the 2spd will handle a threadon but I guess your right about shifting the 2spd under power...
-Mike
mwkeefer
1 MW
Miles,
No doubt.. the 2sp does the thread on and looks deep enough to mate with extension threads for dual freewheels but then how do you reverse pedal to shift?
I guess we still need to have our freewheels broached by Luke or Thud to do a dual freewheel setup (wish somone would introduce normal freewheel with splines).
-Mike
No doubt.. the 2sp does the thread on and looks deep enough to mate with extension threads for dual freewheels but then how do you reverse pedal to shift?
I guess we still need to have our freewheels broached by Luke or Thud to do a dual freewheel setup (wish somone would introduce normal freewheel with splines).
-Mike
mwkeefer
1 MW
Miles,
I was about to suggest a pin clutch mechnism on the pedal freewheel to shift, so we would lock the freewheel... backpedal to shift then unlock it again to prevent another back shift... it may work but it's useless since that would mean the motor has to stop each time we want to shift right? It's not like you want to lock the pedal freewheel (running about 60RPM) to the motor RPM upwards of 420 RPM minimum right?
That said, I don't know how the internals work on this hub but couldn't we just machine in a detent shift cable mount?
-Mike
I was about to suggest a pin clutch mechnism on the pedal freewheel to shift, so we would lock the freewheel... backpedal to shift then unlock it again to prevent another back shift... it may work but it's useless since that would mean the motor has to stop each time we want to shift right? It's not like you want to lock the pedal freewheel (running about 60RPM) to the motor RPM upwards of 420 RPM minimum right?
That said, I don't know how the internals work on this hub but couldn't we just machine in a detent shift cable mount?
-Mike
12p3phPMDC
1 kW
- Joined
- Mar 16, 2009
- Messages
- 462
Are you sure the two speed does the thread on, it looks like the 3 spline sturmey cog to me?
The motor would only need to change direction for a split second, wouldn't require any additional mechanical equipment, and could be accomplished automatically with only a short pause in power delivery.Miles said:
I wonder if its possible to delete the friction shoes or discs in the old Bendix or Sachs two speed hubs.
boostjuice
10 kW
Has anyone ever seen or heard anything about Shimano's version of the SRAM Dual-Drive, the IF-C530 Shimano Nexave Inter-3 Freehub (3X8)??
I cant find much or any info/comments/review on these at all... Are they a 2010 release? or have they been around for a while? The techdocs are published on the Shimano website however there is no sign of the product in the product listings....WTF!
http://techdocs.shimano.com/media/t...IF/EV-IF-C530-2291A_v1_m56577569830609015.pdf
http://techdocs.shimano.com/media/t...30/35H0C-IF-C530-EN_v1_m56577569830605644.pdf
I Like the design of the SRAM/Sachs offerings but the Price including clickbox and shifter is ludacris when you can buy an 8spd Alfine or SRAM imotion-9 for 2/3rds the cost...
Eagerly awaiting pricing on Sturmey Archer's CS-RK3 and this Nexave Inter-3 Freehub. I think some competition in this niche hub market is what's needed to lower pricing to realistic levels.
EDIT- Turns out the IF-C530 Shimano Nexave Inter-3 Freehub is an old disontinued product
I cant find much or any info/comments/review on these at all... Are they a 2010 release? or have they been around for a while? The techdocs are published on the Shimano website however there is no sign of the product in the product listings....WTF!
http://techdocs.shimano.com/media/t...IF/EV-IF-C530-2291A_v1_m56577569830609015.pdf
http://techdocs.shimano.com/media/t...30/35H0C-IF-C530-EN_v1_m56577569830605644.pdf
I Like the design of the SRAM/Sachs offerings but the Price including clickbox and shifter is ludacris when you can buy an 8spd Alfine or SRAM imotion-9 for 2/3rds the cost...
Eagerly awaiting pricing on Sturmey Archer's CS-RK3 and this Nexave Inter-3 Freehub. I think some competition in this niche hub market is what's needed to lower pricing to realistic levels.
EDIT- Turns out the IF-C530 Shimano Nexave Inter-3 Freehub is an old disontinued product
Found this: http://cycle.shimano-europe.com/media/techdocs/content/cycle/SI/Nexave/ST-C530-SM-BC05/SI-6JL0A_EN_v1_m56577569830605728.pdf
Replacement internals for £87...... http://www.petracycles.co.uk/ifc530-replacement-internal-assembly-intergo-p-5904.html
Replacement internals for £87...... http://www.petracycles.co.uk/ifc530-replacement-internal-assembly-intergo-p-5904.html
j3tch1u
10 kW
Miles said:
agree. doesn't appear workable. in addition to a pregnant pause during shifting, after taking up the backlash (if it's anything like a coaster) i think the sudden impact torque would play havoc on the internals. also don't like the idea of an inadvertent-pin-engagement-to-instant-fred-flintstone-cadence
j3tch1u said:Miles said:
agree. doesn't appear workable. in addition to a pregnant pause during shifting, after taking up the backlash (if it's anything like a coaster) i think the sudden impact torque would play havoc on the internals. also don't like the idea of an inadvertent-pin-engagement-to-instant-fred-flintstone-cadence
You'd definitely want a soft-start throttle-up and the impact torque would be the same issue on any geared hub. With a kickback shift you'd be using an extra switch on the controller instead of an extra mechanical connection to the hub. Like all geared hubs, it would be better suited to lower power setups.
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