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Dark Side Trike: One Hand Actuation?
Another option on the Scorpion FX price list: I can have my brakes and
shifters set up either like this: "disc brakes MAGURA BIG hydraulic, one lever actuates both front brakes, rear: Avid V-brake with Velcro-strap as parking brake" or like this: "Onehand actuation brake and shifters MAGURA BIG hydraulic disc brake / DualDrive-drive train with bar end shifter and twist shifter / parking brake with thumbshifter, right hand or left" I can't really understand what each option implies. Is it an advantage to have just one hand doing _all_ the work? If all brakes are actuated by just one hand, one cannot signal with that hand and brake at the same time, for example when turning? By the way, a parking brake is going to be absolutely necessary, as I will be stopping frequently to rest on steep slopes. Also I will need to get out of trike on steep slopes to get around gates and bollards, and I don't want it taking off on its own. I'm also assuming that, being right-handed, I should have the one-hand actuation set up for the right hand, if I decide to go that way. I expect the left hand still gets to shift the front shifter, honk the Airzound and grab the water bottle... EFR Ile de France |
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#2
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Dark Side Trike: One Hand Actuation?
Artemisia wrote:
Another option on the Scorpion FX price list: I can have my brakes and shifters set up either like this: "disc brakes MAGURA BIG hydraulic, one lever actuates both front brakes, rear: Avid V-brake with Velcro-strap as parking brake" or like this: "Onehand actuation brake and shifters MAGURA BIG hydraulic disc brake / DualDrive-drive train with bar end shifter and twist shifter / parking brake with thumbshifter, right hand or left" I can't really understand what each option implies. Ask HPVel themselves to clarify: they know best what they can do and their factory options. Is it an advantage to have just one hand doing _all_ the work? If all brakes are actuated by just one hand, one cannot signal with that hand and brake at the same time, for example when turning? Yes and no. With one hand actuation you completely remove brake steer, the tendency for the bike to turn one way when you only use the brake on that side. It's not a big problem on the Scorpion, but it certainly happens to some degree. I don't know if you can get one hand actuation but with a lever on each side... again, ask HP Vel to clarify. I'm also assuming that, being right-handed, I should have the one-hand actuation set up for the right hand, if I decide to go that way. I would put it on the right but not for that reason: a right turn signal is not actually very important most of the time if you're on the right of the road. Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net http://www.dundee.ac.uk/~pjclinch/ |
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Dark Side Trike: One Hand Actuation?
On 5 Sep, 08:44, Artemisia wrote:
Another option on the Scorpion FX price list: I can have my brakes and shifters set up either like this: "disc brakes MAGURA BIG hydraulic, one lever actuates both front brakes, rear: Avid V-brake with Velcro-strap as parking brake" or like this: "Onehand actuation brake and shifters MAGURA BIG hydraulic disc brake / DualDrive-drive train with bar end shifter and twist shifter / parking brake with thumbshifter, right hand or left" I can't really understand what each option implies. Is it an advantage to have just one hand doing _all_ the work? It is if you only have one (working) arm..... If you look at the SRAM website (http://www.sram-imotion.com/) you will see that dual drive II now comes with a single shifter (twist for cassette, knob for hub), though that might make shifting on a trike interesting? I'd want to try before buying, or at least get clarification from HPV on just what is fitted. |
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Dark Side Trike: One Hand Actuation?
Artemisia wrote:
brakes, rear: Avid V-brake with Velcro-strap as parking brake" By the way, a parking brake is going to be absolutely necessary, as I will be stopping frequently to rest on steep slopes. Also I will need to get out of trike on steep slopes to get around gates and bollards, and I don't want it taking off on its own. Sorry, no expert knowledge of this and I don't want to worry you, I'm just curious - is the parking brake designed to stop the weight of bike + rider rolling back on a steep hill? I've seen descriptions of parking brakes before and thought velcro straps sounded rather feeble then decided they were just meant to stop the unattended bike rolling away. Rob |
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Dark Side Trike: One Hand Actuation?
squeaker wrote:
If you look at the SRAM website (http://www.sram-imotion.com/) you will see that dual drive II now comes with There's an idiotic website: I can't even get past the flash screen. Can you? Not impressed with the design of _tat_. EFR Ile de France |
#6
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Dark Side Trike: One Hand Actuation?
Artemisia wrote:
There's an idiotic website: I can't even get past the flash screen. Can you? Not impressed with the design of _tat_. I meant _that_ EFR |
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Dark Side Trike: One Hand Actuation?
On 5 sep, 10:26, Peter Clinch wrote:
Yes and no. With one hand actuation you completely remove brake steer, the tendency for the bike to turn one way when you only use the brake on that side. It's not a big problem on the Scorpion, but it certainly happens to some degree. HPV claim they have no brake steer on the Scorpion. I think I read that having each brake actuated by a different hand means you can brake more on the inside of a curve. I suppose a skilled rider could ride more skillfully with 2-hand actuation. The Magura Bigs are always 1-hand actuated but the Martas, supposedly even higher end, are 2- handers. EFR Ile de France |
#8
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Dark Side Trike: One Hand Actuation?
Artemisia wrote:
squeaker wrote: If you look at the SRAM website (http://www.sram-imotion.com/) you will see that dual drive II now comes with There's an idiotic website: I can't even get past the flash screen. Can you? Not impressed with the design of _tat_. There are pictures of the DD shifters here then www.easystreetrecumbents.com/stuff/hubs.html They only show the 8x3 version (they've goofed and used the same picture twice I think) but the 9x3 is similar but with a different indicator. -- Phil Cook looking north over the park to the "Westminster Gasworks" |
#9
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Dark Side Trike: One Hand Actuation?
Artemisia wrote:
HPV claim they have no brake steer on the Scorpion. Well, I took one down a steep hill and put on one brake only and it did steer to that side. Not to a significant or in any worrying degree (compare to a Kettweisel, where you can do handbrake turns!), but it did happen. I think I read that having each brake actuated by a different hand means you can brake more on the inside of a curve. I suppose a skilled rider could ride more skillfully with 2-hand actuation. In theory, yes, but in practice I think it's a non-issue. The Magura Bigs are always 1-hand actuated but the Martas, supposedly even higher end, are 2- handers. "High endedness" is nothing to do with why they're single actuation. BIGs are designed for non-*bi*cycle applications including quad bikes and actually come in distinct left and right mounts. Martas are designed for bikes where independent front and rear actuation makes a lot more sense (mount one upside down to get different sides IIRC). Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net http://www.dundee.ac.uk/~pjclinch/ |
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