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Richard230 replied to the thread Brake Free Helmet brakelight.
"
Quote Originally Posted by Stevo View Post
Riding in the fog in Salinas/ Monterey was a little nerve racking I'd say. It certainly cant hurt to have one for this region.
Now I just wish someone would invent a fog free shield that actually works.
I'll back you up on that one. "

22 Hours Ago

UralRider87 replied to the thread Ural sidecar conversion (thinking about it).
" So... Gearing ratios.

The final drive ratio is 4.62:1

The wheels are 19" in diameter, and have tubed tires with high sidewalls. They're off-road tires, so do not follow the usual "180/70R-16" specification format. Tire size is 19 x 4.0.

But easier than all that is just measuring the rear wheel. It is 26.5" in diameter. That means a circumference of 83.25 inches. Or 6.938 feet.

...

Motor rpm range is 900 rpm to 5600 rpm.

4 forward gears (and 1 reverse!)

From the owner's manual, the gear ratios are:

1st 3.6
2nd 2.28
3rd 1.56
4th 1.19

Reverse 4.36

Final Drive 4.62

...

Wheel RPM = Engine RPM / (Transmission Gear Ratio x Final Drive Ratio)

Wheel Speed (in feet/min) = Wheel RPM * Wheel Circumference (in feet)
Wheel Speed (in feet/hr) = Wheel Speed (in feet/min) * 60 (mins/hr)
Wheel Speed (in miles/hr) = Wheel Speed (in feet/hr) / 5280 (feet/mile)

...


Do all that, and you get a table like this:

Attachment 8696


The top speed in each gear (27 mph, 42 mph, 61 mph, 80 mph) agrees with another source, so I believe I'm on the right track.


It should be noted that no-one achieves 80 mph on a Ural. The engine runs out of grunt long before you get there.

Highest I've ever seen on my more modern 2017 is 70 mph, and that involved a bit of downhill and a favorable wind.

Highest I've ever achieved on the one we're talking about here (2007) is about 60 mph. Maybe 62. And that was dicey.

After conversion, I'd be perfectly happy with a top speed of 50 mph on this thing. 55 mph would be great. 60 mph would be amazing.

...

So what does all this tell us?

A few things.

1) Overall gearing ratio.

If we go with an electric motor that spins up to 8000 rpm, we're going to need a total gearing reduction of:

60 mph 10.5
55 mph 11.5
50 mph 12.6

i.e. something in the 10.5 to 12.5 range, or about 11.5 in the middle.

If we keep the final drive, that means we'll need an additional 11.5/4.62 = about 2.5 : 1 gearing reduction.



2) Or if we connect an electric motor directly to the final drive shaft, we have only the final drive ratio of 4.62:1.

That means, we won't want to spin the electric motor any higher than about 3500 RPM. More likely 3200 or 3300 max.

FD only:

RPM Wheel Speed (mi/hr)
---- ----
1000 17.1
2000 34.1
3000 51.2
3500 59.7
4000 68.3 - that would be really fast on a Ural
5000 85.3 - definitely in the danger zone here
6000 102.4 - nope
8000 136.5 - never



3) So if I go with a high-rpm electric motor, I would need to limit the top RPM. Or build an approximately 2.5:1 gear reduction.

Or, if I go with a lower-rpm electric motor, it would probably work just fine coupled directly to the final drive shaft. "

1 Day Ago

Stevo replied to the thread Brake Free Helmet brakelight.
" Riding in the fog in Salinas/ Monterey was a little nerve racking I'd say. It certainly cant hurt to have one for this region.
Now I just wish someone would invent a fog free shield that actually works. "

1 Day Ago

Stevo clicked Likes for this post: Kawasaki zxr-E by flo

1 Day Ago

Richard230 replied to the thread Brake Free Helmet brakelight.
" Here is a YouTube review of the Brake Free light that really shows it off better than I could describe by words. (If a picture is worth a thousand words, what is a 1-minute long video worth?) Plus, the reviewer looks a lot better than I do. https://www.youtube.com/watch?v=fkxnnXlXA2U&t=134s "

1 Day Ago

UralRider87 clicked Likes for this post: Cant figure out how to weight up range/power by Hugues

2 Days Ago

Richard230 created the thread Brake Free Helmet brakelight.
" Here is a review of an interesting safety device that seems useful: My daughter bought a Brake Free helmet light for my birthday at the recent Northern California Motorcycle Show during a visit to the company's exhibit. It connects to the back of your helmet via a permanent stick-on clip and is easily removable by pulling upward to remove or pushing down to connect. It is completely self-contained and does not need any sort of transmitting device to be connected to the motorcycle as was the case with a similar brake light that was on the market a few years ago. It contains a non-replaceable rechargeable battery that is said to last for 9 hours of operation on a charge. Recharging takes 2-3 hours via a USB port.

The device lights up when you slow down with a large series of 100 red LEDs. It is sensitive enough so that it will flash on at a walking pace and then coming to a stop. You can also purchase two additional helmet clips for $13. You get one clip with the Brake Free light and I was given a package of 2 extra attachment clips. I now have the clips fastened to three of my helmets so that I can move the brake light from one helmet to another. There is a mode button at the top of the Brake Free light, which allows you to turn it on and then cycle through three modes: all LEDs on; all LEDs blinking; and a "stealth" mode with just 16 LEDs when steadily riding but with all 100 LEDs flashing when slowing down, which is the one that I like to use. Pushing the button again will turn the light off for storage or recharging.

The light seems like a good safety device for my type of riding, which can be in heavy fog at times and when slowing down while riding my Zero electric motorcycle and using its regeneration feature, which does not turn on the bike's brake light unless you operate bike's brakes to come to a stop.

If you are interested in checking out this brake light, here is a link to the company's website: brakefreetech.com.

Unfortunately, the device is not cheap. Its price is $170 USD. But I don't think there is anything else like it on the market and it seems to be well made and it does function as claimed. "

2 Days Ago

UralRider87 replied to the thread Ural sidecar rider near Philly.
" Thank you both! "

2 Days Ago

flo replied to the thread Kawasaki zxr-E.
" Hi Stevo,
well there are a few aspects to it
First off riding electric, for me is about simplicity. Just ride. Easy tech...

second for registration: as long i would stay below 65hp it would be possible quite free of any hazzle. The zxr could take it in general.
But would it make sense? crazy accelleration to say 130kph? A speed demon is still about two battery generations away, just eats up to much energy- range impaired.
would it be worth the money? From the fun aspect - surely. but here comes

third:
Not only being over 50 now, but also having barely survived a horror crash that cost me 2 years of my life i realised the truth in the saying:"There are fast bikers and old bikers. Fast and old bikers being rare". I am still not free of pain after 22 years and will never again be so. In short i had my share of 100+hp bikes - sold them all off. Nowadays i enjoy riding light bikes (say equivalent to 300/500cc in old currency) just as much.
Nowadays i would take a superbike only to the track - and i am not good enough a rider for such an expensive parttime.

So i guess - maybe... some day

flo "

2 Days Ago

Stevo replied to the thread Kawasaki zxr-E.
" Sounds like the cheapest upgrade.
Do you think you'll ever change the motor, or would that be a whole new project bike?
It would be an interesting learning experience. "

2 Days Ago

flo replied to the thread Kawasaki zxr-E.
" Hi all,
contemplating a controller swap.
Been looking for a size 6 including programing which proves to be difficult as well as quite expensive.

By coincidence i stumbled on an offer for a Gen4 SIZE4 including programing for my me115- reasonably priced.

So question is would you go for it if it was your bike?- or would you still go for a size 6?

To clarify:
Atm the kelly (which is overrated anyway) never showed more than 350 amps on the sachs and rarely more than 320A on the zxr-e - battery side.
It really makes the bike go smooth but but lacks initial accelleration from standstill.
In theory both match the me115 quite perfectly with each around 150 amps cont. and 350 peak as well as 420A boost.
So swapping for the sevcon would give me mostly more from the `"get go" which is what i am after. I do not plan to change for an me1507 or ac20..23 .. QS motor (which is what most conversions use with the sice 6). Overall power is quite enough for what it is intended. And i want to keep it air cooed- so nice not to have fluids on board . I am mostly looking for more fun from low speed.
On top i believe the sevcon will up the power somewhat anyway actually going for 420 amps opposed to the Kelly.

Would a size 6 be of any advantage? (the me115 can only take 420A anyway) Apart from running cooler?
Having, for example, 550A battery side on hand makes sense if motorside only being able to take 420A? Even with pwm considered?

Anyone?

greets Flo "

2 Days Ago

Stevo replied to the thread Ural sidecar rider near Philly.
" Old sidehack racer here looking forward to this build! Welcome !! "

5 Days Ago

Nuts & Volts replied to the thread R6 Frame for sale with motor mounts, bat box and controller mount.
" Updated price. $200 for everything. Still looking to sell this. I also have some batteries I could sell as well Saft/JCI VL41M. 3.7V 41Ah+

https://uploads.tapatalk-cdn.com/202...22eb6b9af6.jpg


https://uploads.tapatalk-cdn.com/202...ac5fdfa083.jpg

https://uploads.tapatalk-cdn.com/202...8c74b42f34.jpg

https://uploads.tapatalk-cdn.com/202...c63e4c0fc6.jpg


Sent from my iPhone using Tapatalk "

6 Days Ago

Spoonman replied to the thread Ural sidecar rider near Philly.
" Welcome aboard!
Plenty of inspiration available here alright - sidecar should make for a very nice project. "

6 Days Ago

Richard230 created the thread Origem's battery swap idea.
" Battery swapping looks good in this video: https://www.youtube.com/watch?v=n7EbjSGgdXk&t=8s "

1 Week Ago

EVcycle clicked Likes for this post: Northern California International motorcycle show by Richard230

1 Week Ago

Richard230 replied to the thread Northern California International motorcycle show.
" Here are two YouTube videos published by a longtime electric motorcycle rider of the two test rides that he took at the 2021 Northern California Motorcycle Show that was held at the Sears Point Raceway, north of San Francisco last weekend.

The first one is of his ride on the new Zero FXE: https://www.youtube.com/watch?v=Sbew-eR1YMw

And this longer one is of his ride on a new LiveWire One: https://www.youtube.com/watch?v=_83m3BeshUQ "

1 Week Ago

Richard230 replied to the thread Northern California International motorcycle show.
" Here is a link to a Motorcycle.com article regarding the 2021 Northern California International Motorcycle Show. The event is described as being "intimate" and the attendance was said to be disappointing. The author talked about a few of the attendees and not about any new motorcycles. Apparently the vendors didn't do much vending, although the test rides were well attended: https://www.motorcycle.com/events/20...sonoma-raceway "

1 Week Ago

tylerwatts clicked Likes for this post: Kawasaki zxr-E by flo

1 Week Ago