Jiglu: BLOKART-NZ: Discussion: Re: Re: Speedometer for blokart

Originally sent by: nonerd

The simplest way is the place your front wheel on the ground with the valve stem in a virtical positon. Mark the point on the surface you are using. Move the wheel forward one revolution until the valve stem is again in a vertical position and and again mark the surface.Measure the distance between the marks and this will give you the circumference. Allow a couple of mm for deflection of the tire under load. I read here a number of different measurements but 982mm seems to be the closest.

----- Original Message -----
From: "lezzmardin" <...>
To: <...>
Sent: Thursday, March 04, 2004 6:05 PM
Subject: Re: [blokart] Re: Speedometer for blokart
Hi Paul i have set my speedo computor at 1018mm is this not correct, i put mark on my front wheel used a tape measure in inches it came to 13 inches ,1018mm.
----- Original Message -----
From: Paul <...>
To: <...>
Sent: Thursday, March 04, 2004 9:54 AM
Subject: RE: [blokart] Re: Speedometer for blokart
Hey Ben,
Calibrate front tyre to 960mm this allows for deflection.
cheers
Paul
Team blokart
-----Original Message-----
From: Lazzar, Ben B [...">...]
Sent: Thursday, March 04, 2004 8:34 AM
To: ...
Subject: RE: [blokart] Re: Speedometer for blokart
HI Guys,
What is the setting that you guys are using for thr smaller tyre
thanks Ben
-----Original Message-----
From: dave.mel [...">...]
Sent: Sunday, 29 February 2004 16:32
To: ...
Subject: RE: [blokart] Re: Speedometer for blokart
Thanks Martin.
Yeah thats the one many of us have, and it will need to be rewired (extended).
Dave
-------Original Message-------
From: ...
Date: 02/29/04 16:12:20
To: ...
Subject: RE: [blokart] Re: Speedometer for blokart
Hi Denis
I picked up a 'Smart' brand computer from DSE in Botany yesterday – it was the only brand they had that I
could see. Also $36, it's in a lime green box and the only place the brand appears is on the actual unit
visible though the window on the front of the box. The Box just says "3 in 1 Cycle Computer – model F9116".
They had about 3 or 4 left yesterday afternoon.
According to the instructions it is fully adjustable for wheel circumference (in mm increments) from 2999mm
down to 10mm! Beats me how they could fit the magnet onto a wheel that small though. Have yet to try fitting
it to the Kart. It will need some form of extension as the wire from sensor to head unit is only 800mm long.
Has km/h or MPH speeds – current speed, average speed, max speed (0.0 to 199 9 km/h, or 0 to 110 mph), trip
time, 24hr clock, alarm clock, trip distance, max speed alarm (fully adjustable up to 199.9 km/h – anyone game
to try THAT?!?), trip time alarm (in case you have an apointment to get back for!) and trip distance alarm.
Instructions also specify it is a most advanced model, and they believe it will become an inseperable friend!
Regards
Martin
-----Original Message-----
From: Denis & Raewyn Agate [...]
Sent: Saturday, 28 February 2004 10:31
To: ...
Subject: Re: [blokart] Re: Speedometer for blokart
Dave,
Are yousure the brand was 'Smart'
'DSE only have the 'Liam' model ($36) but I want to make sure I get a replacement that can do the job. There are no useful specs on it.
Cheers
Denis
----- Original Message -----
From: "Dave Pearson" <...>
To: <...>; "Blokart Smartgroup" <...> Sent: Monday, February 23, 2004 8:53 AM
Subject: [blokart] Re: Speedometer for blokart
Hi Denis.
Your adaption sounds great. You should take some pics and post it on the Smartgroup to show others.
I knew the limitation of the new Cateye's, so avoided buying that type.
The Smart brand speedo has given me no trouble at all, and I have reached and recorded speeds of around 65kph. (Very hard to control at that speed!)
Dave
-------Original Message-------
From: Denis & Raewyn Agate
Date: 02/22/04 12:18:11
To: ...
Subject: Speedometer for blokart
Hi Dave,
Interested in your speedo adaptation, as I have been experimenting quite a bit as well.
I am using a 10-year old 'Cateye Mitty 100' but it can't process the information past 20 pulses/sec which is about 53 km/h.
How fast can the Smart brand' register?
(I made up a reed switch and slid it up inside the front fork, then drilled a hole up directly into the steering column – so there is no visible wiring or sensors at all. It's a very reliable arrangement since it can't get knocked or wet.)
Regards
Denis
2399
----- Original Message -----
From: "Dave Pearson" <...>
To: <...>
Sent: Thursday, February 05, 2004 8:24 AM
Subject: Re: [blokart] Cordless speedometer for blokart
For value for money, I think the best bike computer you can get, which will calibrate for a Blokart wheel is the "Smart" brand available from Dick Smith electronics for $35 ish. I think that this is the type that the Blokart guys have modified.
I know of many people that have used this speedo, and if you are not afraid of doing a little re-wiring yourself then they work perfectly. I have tested the accuracy against my Garmin GPS unit, and it agreed almost perfectly. The key is to enter the correct circumference of your tyre at the laden pressure
There is nothing wrong with the accuracy of the GPS's these days if all you want is a speed reading.
I have wired my bike computer through the handlebar piece, so it is effectively 'cordless'. You just have to remember to disconnect it when you pull the handlebar out. Some people have done much better jobs than I have, and may have their advice also.
Keep in mind that this is only MY opinion, but hope this helps.
Dave
-------Original Message-------
From: ...
Date: Thursday, February 05, 2004 08:06:21
To: ...
Subject: Re: [blokart] Cordless speedometer for blokart
I am also interested in the best type of speedo. Has anyone any
comment on the accuracy of the small GPSs you can buy now?
regards
Russell
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EOM
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