Adding Throttle to Multispeed Bike

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jkbrigman   10 kW

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Adding Throttle to Multispeed Bike

Post by jkbrigman » Sep 10 2012 7:07am

We've got full-grip throttles, thumb throttles and half-grip throttles...And none of these will work with anything besides trigger shifters without removing the shifter and losing the gearing.

I see some bikes in which the front derailleur is removed completely and the chain runs on only one of the two or three front sprockets, then a throttle is installed on the left side. So far, that's the only answer i can come up with that will work, but I hate losing the gearing...
throttle.JPG
Left side handlebar with front derailleur shifter. Throttle is rightmost element. Push paddle over the top to accelerate.
throttle.JPG (96.6 KiB) Viewed 3674 times
Here's my answer so far. It works, but it's odd. Do you think there a better way?

- switching to trigger shifters?
- installing some kind of "long reach" thumb throttle?
- removing the front derailleur shifter completely and just having one speed up front?
Last edited by jkbrigman on Feb 17 2013 7:19am, edited 7 times in total.
eRecumbent. 9C 2810, 6-FET,CA,18S3P LiPo, Kenda Kwest. 33mph max 12.8Wh/mi (22mph avg) Phat Bike Commuter HS3540, 6-FET, 18S3P LiPo, Schwalbe Marathon 47mph max 25 Wh/mi (28mph avg) Basic LiPo Charging Thread , Add Throttle to Multispeed Bike
dogman: "I bet if you just don't ride like a jerk, you can do whatever you want up to the speed where everybody looks at you like this. :shock: "
tomjasz: "Romans go full dork. They could give a hoot what 'Merkins do."

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winkinatcha   10 kW

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Re: Adding Throttle to Multispeed Bike

Post by winkinatcha » Sep 10 2012 7:28am

Hey mate,

I have one solution, and that is putting a thumb throttle on a "bar-end"

Vis:
ThumbThrottle barend.jpg
ThumbThrottle barend.jpg (58.31 KiB) Viewed 3957 times
Wire Loop under Handgrip.jpg
Wire Loop under Handgrip.jpg (52.43 KiB) Viewed 3957 times
Note how I ended up running the thumb throttle cable as a lop beneath the grip, so it wouldn't interfere with the twist grip gear shifter.

Also note, this was for a road oriented build, not necessarily a good idea for off-road...

with this setup, I found it quite ok to have my right hand on the bar end and moving my left down to brake ... Shifting the rear gears (right hand) still required hand off throttle but didn't find it that inconvenient...

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winkinatcha   10 kW

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Re: Adding Throttle to Multispeed Bike

Post by winkinatcha » Sep 10 2012 7:35am

'Course you could always go PAS, adn do away with a handle bar mounted throttle altogether...

I've used PAS only on v low power builds... It takes a bit of getting used to, and I had to rethink how I used the gears... Mainly gearing DOWN as one is coming to a stop, so that takeoff has a quicker cadence to get the PAS system engaging sooner, rather than staying in a higher gear and having to start pedal only in a high gear.
Joe
My primary orientation is an e-bike mechanic, but I also build, ride and do stupid things.
I have a pretty comprehensive e-bike/bicycle workshop and run an e-bike centric business.
http://frankencycle.me/

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Re: Adding Throttle to Multispeed Bike

Post by amberwolf » Sep 10 2012 7:43am

Flip a half-grip throttle around so the grip is on the inside, and you can use it with a grip-twist shifter easy enough.

I use a thumb throttle on DayGlo Avenger with a grip-twist throttle, too, nothing special, though I have to shift my hand over the grip a little.
DSC03338.JPG
DSC03338.JPG (60.22 KiB) Viewed 3953 times

And as Winkinatcha posted while I was searching for the pics, youc an also do it on a bar-end:
DSC03477.JPG
DSC03477.JPG (27.83 KiB) Viewed 3953 times

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MadRhino   100 GW

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Re: Adding Throttle to Multispeed Bike

Post by MadRhino » Sep 10 2012 8:05am

Now I build single speed, but my first 2 builds had full gear set on the rear.
Use a right hand grip shifter, mount it reverse on the left side and you can shift up to 9 gear with the left hand, while controlling the grip throttle with the right. That is the most natural method I found, until I realized that I have no need to shift and can stay on high gear at all times.

2 gears is best IMO, with a Schlumpf HS drive planetary crank set (2.5:1 ratio) and a single freewheel on the motor. That is enough to be able to easily pedal a heavy bike without power, and to let you pedal with the motor at high speed without the need of a big chain ring.
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Re: Adding Throttle to Multispeed Bike

Post by icecube57 » Sep 10 2012 2:34pm

I use thumb throttle on my Tidal Force.. always felt good... never broken one either and Im aggresive.

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Re: Adding Throttle to Multispeed Bike

Post by d8veh » Sep 11 2012 6:33am

A thumb-throttle will often just fit. You have to get the angle just right so that it nearly touches the shifter at full throttle.
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Re: Adding Throttle to Multispeed Bike

Post by dogman dan » Sep 12 2012 5:29am

Two solutions work best. Both involve dumping the grip shifter.

If you don't care about ebrakes, or can tolerate just one brake handle having ebrakes, replace the right shifter with a trigger shift. Not really that costly compared to how much better it is.

Or replace that shifter with an old school non indexed lever shifter. It can likely be mounted inboard enough on the bars to work fine. Definitely an option to move the 7 speed shifter to the left side, and use the old school shifter for the front derailur.

and lastly, another works but not so elegant solution. Using a broomstick, lengthen the handlebar 2 inches. Then mount the shifter as far in as you can get it, and then mount your throttle on the outside of the shifter. You won't use that shifter so much anyway.

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Re: Adding Throttle to Multispeed Bike

Post by jkbrigman » Oct 04 2012 10:28pm

Hey All - these are some excellent suggestions and I appreciate every single one of them. I've not done anything just yet, but will soon. All options are on the table!
eRecumbent. 9C 2810, 6-FET,CA,18S3P LiPo, Kenda Kwest. 33mph max 12.8Wh/mi (22mph avg) Phat Bike Commuter HS3540, 6-FET, 18S3P LiPo, Schwalbe Marathon 47mph max 25 Wh/mi (28mph avg) Basic LiPo Charging Thread , Add Throttle to Multispeed Bike
dogman: "I bet if you just don't ride like a jerk, you can do whatever you want up to the speed where everybody looks at you like this. :shock: "
tomjasz: "Romans go full dork. They could give a hoot what 'Merkins do."

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Re: Adding Throttle to Multispeed Bike

Post by icecube57 » Oct 05 2012 12:35am

Pull trigger throttle.Or.... Get rid of those lame end bar thingys and go for a thumb throttle.

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jkbrigman   10 kW

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Re: Adding Throttle to Multispeed Bike

Post by jkbrigman » Nov 11 2012 1:58am

Hey guys - I came up with a simple option that seems to be working: I got a simple round handlebar grip, trimmed off about 30% and slide the shifter and brake lever toward the end of the handlebar. That left JUST ENOUGH room to get a trigger throttle installed and clamped. Build thread with pics shortly....
eRecumbent. 9C 2810, 6-FET,CA,18S3P LiPo, Kenda Kwest. 33mph max 12.8Wh/mi (22mph avg) Phat Bike Commuter HS3540, 6-FET, 18S3P LiPo, Schwalbe Marathon 47mph max 25 Wh/mi (28mph avg) Basic LiPo Charging Thread , Add Throttle to Multispeed Bike
dogman: "I bet if you just don't ride like a jerk, you can do whatever you want up to the speed where everybody looks at you like this. :shock: "
tomjasz: "Romans go full dork. They could give a hoot what 'Merkins do."

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Re: Adding Throttle to Multispeed Bike

Post by shock » Nov 11 2012 11:13am

I run a half twist on the right side, and moved the 7 speed shifter to the left. (I run a single sprocket front) Had to turn the shifter upside down, but it still works just fine. I also swap my brakes, so the front is on the right. Just seems more natural for a "motor" cycle.
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jkbrigman   10 kW

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Re: Adding Throttle to Multispeed Bike

Post by jkbrigman » Nov 15 2012 10:11pm

I ended up robbing handlebar grip to pay throttle. Here's a photo of what it looks like:
throttle.JPG
From Left: handlebar grip, shifter, brake and then thumb throttle
throttle.JPG (73.72 KiB) Viewed 287 times
A trigger shifter would completely solve this problem and allow me to return to using the stock (anatomic) handlebar grip.
eRecumbent. 9C 2810, 6-FET,CA,18S3P LiPo, Kenda Kwest. 33mph max 12.8Wh/mi (22mph avg) Phat Bike Commuter HS3540, 6-FET, 18S3P LiPo, Schwalbe Marathon 47mph max 25 Wh/mi (28mph avg) Basic LiPo Charging Thread , Add Throttle to Multispeed Bike
dogman: "I bet if you just don't ride like a jerk, you can do whatever you want up to the speed where everybody looks at you like this. :shock: "
tomjasz: "Romans go full dork. They could give a hoot what 'Merkins do."

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jkbrigman   10 kW

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Re: Adding Throttle to Multispeed Bike

Post by jkbrigman » Nov 28 2012 9:49am

Status Update: A pretty long 28 mile road test is done and the "very far in" throttle worked like a champ. Note that this is a right-hand throttle which is mounted upside-down on the left side.

Turns out, when I shift to high gear (largest sprocket) on the left shifter, I can pretty much leave it alone and work the throttle and right hand shifter. I'm feeling the difference in the handgrips, though: my left hand starts to get tingly when my right isn't (the right is still an anatomic grip).

I'm starting to warm up to the idea of removing the front derailleur and replacing the front sprocket on this bike with something larger. Losing the shifter would allow me to use my nice 1/3rd grip throttle and go back to the stock handgrip. Would love to switch up to a schlumpf drive on this bike, but that costs more $$ than the whole bike!
eRecumbent. 9C 2810, 6-FET,CA,18S3P LiPo, Kenda Kwest. 33mph max 12.8Wh/mi (22mph avg) Phat Bike Commuter HS3540, 6-FET, 18S3P LiPo, Schwalbe Marathon 47mph max 25 Wh/mi (28mph avg) Basic LiPo Charging Thread , Add Throttle to Multispeed Bike
dogman: "I bet if you just don't ride like a jerk, you can do whatever you want up to the speed where everybody looks at you like this. :shock: "
tomjasz: "Romans go full dork. They could give a hoot what 'Merkins do."

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Re: Adding Throttle to Multispeed Bike

Post by Kinni420 » Mar 23 2013 11:27am

I just modified my shifter a bit. It didnt originally fit over the large potentiometer so I just filed down the up shift lever to fit over it. The shifter now doesnt fit over the grip in an ergonomic way anymore and I have to move my hand off the full twist to get to it but I dont think Ive actually shifted gears in over 2500 miles. :lol:
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