Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies
23 posts • Page 1 of 1
the speedo has one large button on the bottom yes? well it actually functions as two left does mode reset etc right changes and adjusts. if you hold left side in the light should come on. i bought one brand new but there were no englsih instructions. hope that helps??
I also have the tronica unit..... quite a good little device. I cannot put my hands on the instructions though .... and I would like to reset it for the wheel size of my bike. Any chance that you still have the scanned image? I would be thankful for a copy to be emailed if possible
I have a tronica Wireless Cycle Computer and yes I don't have instructions for assembly. I bought it some time ago (about 1 year) but when I opened it today no instructions. Would appreciate if anyone can help by emailing a copy or instructions on placement and setting the computer. My email is [email protected]
Re Tronica Wireless computer, I would appreciate if someone could email a copy of the instructions to [email protected] I have had my unit for about 2 years now and have found it quite reliable but need to reprogramme it for new wheels.
Thanks Ubon Vet
I recently resurected my Tronica, but cannot find the instructions. After replacing battery, the unit should start flashing ready to program settings. Forgive me, but i cant remember what order right now (and I'm not about to reset mine to check ) but i'll give it a go.
I think right button skips to next setting, left button changes settings - if it's the other way round, sorry - take battery out and start again.
First setting is the wheel size - I used Sheldons Calibration Chart to figure out - I'm on 700x23, and used Group F, i.e. 2097
Next setting I think is your age - should be 2 digits flashing
next is weight - 3 digits flashing.
I think there is another setting next, but i cannot work out what its for so i left it as default.
Next is possibly Mph or Kph
Then should be the time and time format (12hr or 24hr)
That should be it - it should go to the main screen and be ready to rock n roll.
Note - no responsibility taken if this proves to be utter bollocks and i'm talking through my hat
"First setting is the wheel size - I used Sheldons Calibration Chart to figure out - I'm on 700x23, and used Group F, i.e. 2097"
Align valve with expansion joint in concrete.
Roll bike forward one complete revolution of said wheel.
Make mark on concrete with pencil, stone, corner of brick etc., in alignment with valve.
Measure distance with tape measure or ruler.
I turned my watch back, so I would not be late.
I've got a few of these Tronica speedos on my bikes, and noticed something interesting the other morning. I was waiting for my riding mate at the back of a secure building in Subiaco where the card access door is, and got close to the door to get the heat that comes out through the slots cut in the roller door from the building AC (it was 4 degrees at 5am), when i saw I was registering 74.7km/h, with both feet firmly on the ground! I was near the card reader, so I got back more than 18" and it stopped. I took the computer off the handlebars and put it close, but nothing happened. I then pushed the whole bike back again, and watched it flicker between 74.7km/h down to 74.2km/h. The cards are a sort of RFID, so i think that the exciter pulse must be going off roughly 10 times per second and be picked up by the wireless sensor on my fork and be sent to the computer by its normal wireless signal, which i think is something similar to Bluetooth. A bit under 10 per second, as the 27x1 1/4 tyre was set as 2171mm in the computer. I keep away from the card sensor since then, as there's no joy in a mileage on your odo that you haven't actually sweated for, is there?
Why do you say this Rumpy ? I've recently set up my 700x23C Group F wheels on a wired BRI3 with this figure ... It was slightly different to other figures I googled .. are you saying SB's figure is not accurate ?
Sheldon Brown's figures are probably a good estimate but since different tyres don't neccesarily measure the same despite the same size designation and running different pressure, different weight on the tyre etc all make a difference too you can get a more accurate measure using Rumpy's method although there was one important point missed, you must ride the bike, not just wheel it, as your weight on the bike will compress the tyre giving it a smaller circumference.
My preferred method before going GPS was to use an estimate then ride a section of road of known distance, compare the distance on the computer with the known distance and recalculate based on the error.
I've got a Tronica non-wireless that I bought at Aldi for $10 about 2 years ago and it hasn't missed a beat. The spanner icon is just telling you it thinks the bike needs a service (it can be set to appear after x kms). I've got my instructions at home for the non-wireless version. I'm happy to scan and email if that helps anyone.
How accurate is your car odometer? I know mine is out by somewhere between 100 and 200m over 5 km.
23 posts • Page 1 of 1
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