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What do i set my F-8 speedometer to on a bike with 26x2.125 tires?

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Hello i have bought new tyres and the rear tyre is a different profile it should be an 130 /80 /17 and the rear tyre arrived as a 130/90 /17. Will the 90 be ok on the bike thanks for your reply


Hi, Caroline the 90 should be ok it is a taller profile which may affect your speedometer accuracy by 10% it will also decrease your cruising RPM slightly which adds longevity to your engine life. Depending on the year-make-model of your bike the speedometer may be recalibrated to compensate the difference..
For this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Tire Sizes Explained Dennis Kirk Inc
Motorcycle Tire Guide 101 and FAQ
How to Read Motorcycle Tire Sizes

Apr 06, 2017 | Motorcycles

3 Answers

My speedodemeter is off by 8 miles an hour could that be fix just by changeing out my transmission because the transmission doesn't shift right it takes a min.


Assuming you replace it with the same transmission it should be fine. If you've changed your tires to a larger or smaller size it can also effect your speedometer. If this is the case it can usually be corrected by replacing the speedometer cable with one for that particular combination. If your transmission isn't shifting right you should check the fluid level. Also check for any transmission leaks because those can effect the shifting as well.

Mar 02, 2011 | 1992 Chevrolet S-10 Blazer

1 Answer

Why is the speedometer reading faster than the bike is really traveling?


Because the tire is a smaller diameter then it needs to be to give you an accurate reading. If a tire diameter is too big , you will get a slower reading on your speedometer. If a tire diameter is too little you will get a higher reading on your speedometer. A tire that is manufactured can say it is a certain size , but it can bigger or smaller than that size with in a certain percentage and still be the size they say. Say you are running a 100/100x19 and your speedometer reads too high a speed. Then, when you replace the tire try a 100/110x19 size (taller) and you may be able to correct the inaccuracy.

Oct 21, 2010 | 2005 Honda VTX 1300 R

1 Answer

My friends 2009 Honda CBR 1000 shows about 8mph less than my 2010 Yamaha Majesty. Are there know issues with the Majesty? Could there be something wrong with my bike's speedometer? I just bought it 2...


Sometimes there is some variance between identical new motorcycles. I had friend claim that his BMW speedometer was accurate and my Honda was off by 5 mph. We had the same brand(Dunlop) and size of tire. I changed my tire, same brand(Dunlop), same size, different "style" and now both speedometers read the same speed . This tire was the same number size but mounted stood taller than the old tire. What my friend failed to realize was that his cycle came stock with a Metzeler so he was not reading accurately either. So do not dismay, your friend may not have the correct height tire on his bike. You will have to make some speed runs past on of those signs that tell you how fast you are going and see how accurate your machine is. My 2009 Suzuki DR200 reads 2 MPH slow by the police speed signs.

Sep 11, 2010 | Yamaha YZ 450 F Motorcycles

1 Answer

Hi! My bike sat in climate controlled storage for 8 mos. 800 miles on it. The battery was dead and wouldn't take a charge from my trickle charger. A bike shop across the street from storage (they don't...


Battery is not good, does not have enough amperage, try connecting car battery with jumper cables or use battery charger with engine start if bike starts, buy new battery

Aug 11, 2010 | Harley Davidson XL 1200 C Sportster Custom...

1 Answer

I have a 2003 suzuki volusia 800 cc and my speedometer does not work, to include the mileage meter


You will need to replace the speedometer sensor which is located on the right side of the front tire hub. It costs about $130.00. To do it yourself, you'll need to hoist the bike so the front tire is off the ground. Remove the front tire. The sensor is that black doughnut looking thing with a wire attached. Repace that and you should be good to go.

Jul 19, 2010 | 2002 Suzuki VL 800 Volusia

1 Answer

Speedometer/odometer stopped working. Removed ca...


Because the inner cable has to turn and flex as it spins, they can occasionally break, this can be normal wear and tear. other reasons can be rust from washing, incorrect installation when changing tyres, or the outer has been kinked or damaged. Repace inner and outer as a set, apply some light lubrication.

May 19, 2010 | Motorcycles

1 Answer

Speedometer stoped working


On most models bikes with a dial not digital, all you have to do is un-bolt the face and stand the bike upright with front tire straight you will see a cable loose that just needs to be pulled up a bit and re-screwed down... If its digital check fuses...

Apr 15, 2010 | 2005 Honda CBF 250

2 Answers

82 Harley XLS


The cable will attatch to the back of the speedo, and attatch at the front wheel. You should have a speedo spacer installed on the left side of the rim ( between the tire and the front left fork leg ) . It screws into the spacer. then there is a little locking set screw to hold the cable from unscrewing itself.

Mar 14, 2009 | Harley Davidson Harley-Davidson Motorcycle...

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