My wife and I bought Turbo Vado 3.0s in November 2019 (2020 model,I think). Now that I have mission control working on my iphone, I can see that her wheel circumference and mine are set differently, and neither is correct. I believe correct setting is 2250mm. Hers reads 90 inches (2286mm), mine reads 2190 mm. I'm also not sure why she is imperial and I am metric, but oh well. After some research I see that MC is not enabled to change this, it has to be LBS. The problem is that my LBS has not found how to do this, and not been able to reach Specialized for help. Does anyone out there know how the LBS can modify this? Not a big deal, more aggravating. We love our bikes, but tired of me getting more mileage than her on the same ride.
Turbo Vado 3.0 Adjust Wheel Circumference
- Thread starter Paul58D
- Start date
I think that when I took our bikes to LBS they were able to synch them so both are now 2293mm (mine) and 90 inches (hers). So while it doesn't look like that is "correct" circumference, as long as we are the same I guess I can live with that. We'll just be constantly shortchanged on our legitimate mileage, which will no doubt be of some consequence somehow down the line (or not!!)
PaD
Well-Known Member
I’ve heard that there is general rule that the height of the tire is the same as the width. It is of course not a fact for all tires.
A 622mm rim with 47mm tires ( Trigger Sport) would have a total diameter of 716mm and the circumference would be 2249.3803mm (I rounded down that a bit. know Nasa JPL use 15 decimals for pi but I have a hard time remembering more than 7
)I tried to measure a Trigger tire and came to something near 2250mm. Don’t know why Specialized has 2293mm as default. 1.8 - 1.9% difference probably doesn’t matter much but I can’t help wondering why it is 2293mm.
Or why some bikes are set to 2286 or 2190.
Sierratim
Well-Known Member
- Region
- USA
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- Nevada City, CA & Paradise Valley, AZ
Our two Vados came setup from the LBS with different wheel circuferences. Very odd. At our 30 day check ups they adjusted them to be correct, and the same.
Stefan Mikes
Gravel e-biker
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- Europe
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- Mazovia, PL
It's a little bit aggravating. I would like to know myself how the LBS could set the proper wheel circumference. There are wheel circumference tables on the Internet. However, the wheels in my Vado are 51-622, which is an untypical size (typical is 50-622). I feel the circumference of the wheels of my Vado is somewhat greater than the 2255 hard-coded in my bike's electronic. I'm on bad terms with my LBS and would be glad if I could precisely request them to "do this and that" to fix the proper parameter.
PaD
Well-Known Member
If we believe the rule saying tire height is equal to width your wheel diameter is 622+51+51 = 724
Circumference is 724 x pi = 2274.5
A worn tire probably has a little lower profile.
Dealer should be able to set circumference in whole numbers between 2000 and 2400. Excatly how they do it I don’t know but they connect computer through the TCD.
Stefan Mikes
Gravel e-biker
- Region
- Europe
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- Mazovia, PL
PaD
Well-Known Member
Well it’s less than 1% so your odo and speedo insn’t off by much.
Sierratim
Well-Known Member
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- Nevada City, CA & Paradise Valley, AZ
Schwalbe publishes a table of tire circumferences at https://www.schwalbetires.com/tech_info/tire_dimensions . The closest they list to @Stefan Mikes tire is a 50-622 with a circumference of 2280mm. You could adjust this for the 51-622 tire by calculating effective diameter of the 50-622 tire and adding 2mm.
Tread design can impact this. In years past I would measure the actual circumference by marking the rolling distance of the tire for 1 full revolution. The results were always less than 1% variance from the Schwalbe table so they are my go to now.
My rolling distance measurements did ignore the impact of rider weight on the effective diameter of the tire. I tend to run my tire pressure at the high end so less of an impact. Lower pressures will have more of an impact.
Stefan Mikes
Gravel e-biker
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- Europe
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- Mazovia, PL
OK. My Lovelec has 40-622 tyres now and a display in which you cannot enter the wheel circumference (the stock tyres were 42-622). The Vado has the 51-622 tyres and presumably wrong wheel circumference set in the software. Both displays give exactly the same distance ridden on the same route, and the distance is in pretty good agreement with the GPS. I won't change anything. It works 
Sierratim
Well-Known Member
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- USA
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- Nevada City, CA & Paradise Valley, AZ
I'm a big believer is staying with what works...OK. My Lovelec has 40-622 tyres now and a display in which you cannot enter the wheel circumference (the stock tyres were 42-622). The Vado has the 51-622 tyres and presumably wrong wheel circumference set in the software. Both displays give exactly the same distance ridden on the same route, and the distance is in pretty good agreement with the GPS. I won't change anything. It works
Ride on!
Our turbo vados have circumference set to 2193mm (hers) and 2290mm (mine). Today ride showed 16.4 miles on my bike and 15.7 miles on hers. Again, not a big deal but somewhat frustrating. Still trying to find out if LBS has gotten in touch with SpecializedOK. My Lovelec has 40-622 tyres now and a display in which you cannot enter the wheel circumference (the stock tyres were 42-622). The Vado has the 51-622 tyres and presumably wrong wheel circumference set in the software. Both displays give exactly the same distance ridden on the same route, and the distance is in pretty good agreement with the GPS. I won't change anything. It works
My LEVO 1.0 normally comes with 47cm tires, like most LEV0's I have seen. I had my LBS to put 38cm tires on when I purchased it last year. I had to have the LBS change the wheel circumference on the computer. It could not be done from the display by me.
Sierratim
Well-Known Member
- Region
- USA
- City
- Nevada City, CA & Paradise Valley, AZ
Correct, wheel circumference is a dealer only setting. I'm guessing this is intended to prevent spoofing the speed limit settings for motor assist.
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