Hobbit Speedo Replacement

Jerry Graham /

Hard to find a speedometer cable for a Hobbit, so I took a 40MPH CEV speedometer and dremeled out the Headlite bucket on the Hobbit to fit. How do I , or can I calibrate it to give a good reading. Right now it shows me going over 40mph with a Promo and no other modifications. The CEV came off a bike with 16 inch wheels.

CEV.jpg

Re: Hobbit Speedo Replacement

Jerry Graham /

Also it is holding right at 38-39 actual mph on a flat,

Re: Hobbit Speedo Replacement

Emil Kniemel /

The CEV cable fits the stock speedo drive?

Re: Hobbit Speedo Replacement

Jerry Graham /

Yeah Emil the Cev Cable small end fits on the wheel drive, but the large end does not fit onto the stock Hobbit speedometer head, that is why I thought I could use the CEV speedometer.

Re: Hobbit Speedo Replacement

Emil Kniemel /

I imagine that the speedo is calibrated for 16" wheels. Might just have to find another speedo that is for 17" wheels.

Ubfortunately, I do not know of a way to recalibrate speedometers.

Re: Hobbit Speedo Replacement

Downhill Harvey (OFMC) /

A 16 inch wheel would make the speedo's mph even higher, not lower.

Re: Hobbit Speedo Replacement

CHEAP ROUTE:

Crack open speedometer and swap out the speedo return spring. The stiffer the spring, the lower the indicated speed. Carry around a GPS to check calibration

EXPENSIVE ROUTE 1:

Buy a new sender, cable and speedo.

EXPENSIVE ROUTE 2:

Buy a digital speedometer that will be 100% more accurate than anything analog.

FREE ROUTE:

Carry around a GPS on one ride, and figure out how fast you're REALLY going when the speedo hits 10, 20, 30, and maxes. Remember this offset.

Re: Hobbit Speedo Replacement

So, double check the drive ratio. I did the VDO version of this. You can get different ratios in the speedo drive. Numbers are on the drive I think. Anyway, my VDO setup was from a bike with 16" wheels and the speedo is spot on on my 17" hobbit wheels. Most stock setups I have had are a little optimistic on speed, so having the larger wheels actually made mine closer to reality. Maybe spin the plate with the numbers in the speedo so they are correct?

Re: Hobbit Speedo Replacement

Jerry Graham /

Just trying to keep it simple, the wifes bike and I really dont want to ruin the riding for her. Colin I will have to check my shelfs and see if I even have a VDO set-up. Thanks for the lead.

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