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I’ve got an ‘03 x1800c that came with 180/70-16 rear tire. Is there any significant downside to going to a 65 aspect ratio on a replacement tire? It reduces the rear end height by 1/4”. I think it will be insignificant but just wanted to hear thoughts


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.

why not

my VTX1800F.. calls for a 180/55x18 ( radial ) rear tire.

I have been running for 12 years 200/50x18 ( radial ) rear tire.

wider and a lower aspect


measure twice,, install once.
:)
 

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A quarter of an inch isn't much difference. However, it will make your speedometer and odometer less accurate, since it will appear that you are riding faster and further than the actual speed and distance.
 

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a friend of mine asked I post this
you could mention to that guy that wants a 65 profile that it will help to true the speedo error a bit.


I will add to this.

Honda is well KNOWN to have a 7 to 10 percent error on speedometer but only a 1 percent error on the odometer

on my "F" .. going down one aspect... my speedometer is only off by 3 mph.. instead of 7 mph
per my Garmin GPS...
 

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Now I'm confused.
 

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calibrating your speed to a garmin gps is not accurate.
the signal has to leave your device
hit a satellite
and come back down.
it is not instant and does take time....very little

it is fairly accurate but i will take the speed my Honda says as true.
 

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I’ve got an ‘03 x1800c that came with 180/70-16 rear tire. Is there any significant downside to going to a 65 aspect ratio on a replacement tire? It reduces the rear end height by 1/4”. I think it will be insignificant but just wanted to hear thoughts


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Going from 70 to 65 aspect ratio, if the tire is still 180 mm wide, will lower the rear about 9 mm (0.35") and your speedo will show even higher (it indicates higher already) speed than your actual speed is. If the new tire isn't 180 mm wide, that changes the result of this calculation...
 

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calibrating your speed to a garmin gps is not accurate.
the signal has to leave your device
hit a satellite
and come back down.
it is not instant and does take time....very little

it is fairly accurate but i will take the speed my Honda says as true.



Never said I did.


You can take your speedometer as accurate ..
but 16 years of owners proving Honda speedometer are "OFF" .. by many methods.


including police speed radar guns. ( tickets ).


https://www.cycleworld.com/sport-rider/how-to-fix-calibrate-inaccurate-motorcycle-speedometer/
https://www.dakotadigital.com/index.cfm?ptype=product&product_id=240
https://www.healtech-electronics.com/products/sh/


I am not talking "SMOKE"
20 years as a Honda dealership mechanic..
 

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Going from 70 to 65 aspect ratio, if the tire is still 180 mm wide, will lower the rear about 9 mm (0.35") and your speedo will show even higher (it indicates higher already) speed than your actual speed is. If the new tire isn't 180 mm wide, that changes the result of this calculation...
Not confused anymore.:thumbup:
 

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the reputation of Honda quality and reliability and they cant a speedo to read correctly??


complete nonsense imo.



you MISS the point entirely


its to reduce riders Speeding... so speedometer reads faster then you are going.....
less speeding tickets.


FACT.. and has for about 30 years..

you do not have to believe it...


I am HONDA Rider ... 9 Honda motorcycles over 50 years.. NO GAPS...
8 were from NEW.


5 New Honda Cars
1 Acura Legend. as a 1 year old. 18 years and 200,000 miles.

Honda water cooled lawn tractor.. from new (1992) to 2019


I also guess.. you missed my statement
I was a Honda Dealership motorcycle mechanic for 20 years..
HONDA Trained.. Like my friend PhilsCBX....
not some trade school.
 

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complete nonsense..


i dont care what you own or how long you have worked on bikes.


your words are an opinion like anybody else's on this forum.:nerd:. .
 

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complete nonsense..


i dont care what you own or how long you have worked on bikes.


your words are an opinion like anybody else's on this forum.:nerd:. .
What is a fact is Honda VTX1800 speedo's read fast...
 

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calibrating your speed to a garmin gps is not accurate.
the signal has to leave your device
hit a satellite
and come back down.
it is not instant and does take time....very little

it is fairly accurate but i will take the speed my Honda says as true.
Garmin GPS unit is a Receive Unit only.
It receives signals from four or more different satellites to determine your location.
https://spaceplace.nasa.gov/gps/en/
 
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