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+--- Thread: Speedo Gearing (/showthread.php?tid=1557)
Speedo Gearing - Chris KC - 08-08-2018
I'll be the first to admit that I've not thought about this very deeply, nor scoured the test books; but my Ulster rep indicates approx half true road speed on the speedo.
It has a four speed gearbox, 19" wheels and 4.9 axle ratio.
Wrong speedo I presume?
Or is it possible to swap the drive at gearbox end and correct the reading?
Any thoughts welcomed. I have got used to 'factoring' the road speed but I thought it might be fun to watch the needle hit the end stop some day!
RE: Speedo Gearing - Ruairidh Dunford - 08-08-2018
This may be of use in proving a 'correction' device Chris.
http://pub25.bravenet.com/forum/static/show.php?usernum=2099944454&frmid=5&msgid=936935&cmd=show
RE: Speedo Gearing - Chris KC - 08-08-2018
(08-08-2018, 09:19 AM)Ruairidh Dunford Wrote: This may be of use in proving a 'correction' device Chris.
http://pub25.bravenet.com/forum/static/show.php?usernum=2099944454&frmid=5&msgid=936935&cmd=show
Brilliant, thanks Ruairidh - that seems to cover all the options.
RE: Speedo Gearing - Chris KC - 08-08-2018
In case this topic has piqued anyone's interest, I can now add that both Speedy Cables (London) and Speedograph Richfield (Nottingham) offer a speedometer recalibration service to customer requirements, at £80 and £75 respectively.
Also of possible interest is that Speedograph Richfield offer a range of corrector gearboxes (which also accommodate cable routing changes), typically about £90.
http://www.speedograph-richfield.com/html/minature_gearbox.html
RE: Speedo Gearing - Mark McKibbin - 03-10-2018
Thanks Chris, looks like this is a well researched topic. Think I will go for a corrector box if Speedograph has the right ratio.