860C Display Programming?

J

jam66

New Member
What wheel size should be programmed in the settings for a 26” Fat Tire Bike with 4.5” tires?
Its set a 26” but does that mean old school Mt Bike Wheels? Isn't a 26” Fat Tire 4.5” tire closer to a 29” wheel in diameter?
 
jam66 said:
What wheel size should be programmed in the settings for a 26” Fat Tire Bike with 4.5” tires?
Its set a 26” but does that mean old school Mt Bike Wheels? Isn't a 26” Fat Tire 4.5” tire closer to a 29” wheel in diameter?
Click to expand...
You can set the wheel to what ever you want. In fact if you set it lower than the actual wheel you get more speed out of the system. The drawback is you speedo and mileage will be incorrect. To check speedo accuracy use a gps on a smart phone and trial and error.
Otherwise just measure the wheel including the tire. I often run my 26 inch at 18 inches for some extra speed.
 
That's my understanding, that 29" setting comes out pretty accurate.
 
JES2020 said:
You can set the wheel to what ever you want. In fact if you set it lower than the actual wheel you get more speed out of the system. The drawback is you speedo and mileage will be incorrect. To check speedo accuracy use a gps on a smart phone and trial and error.
Otherwise just measure the wheel including the tire. I often run my 26 inch at 18 inches for some extra speed.
Click to expand...

Why not just increase your top speed in the settings?
 
jam66 said:
What wheel size should be programmed in the settings for a 26” Fat Tire Bike with 4.5” tires?
Its set a 26” but does that mean old school Mt Bike Wheels? Isn't a 26” Fat Tire 4.5” tire closer to a 29” wheel in diameter?
Click to expand...

To accurately measure your tire...
Put a mark on the tire near the tread. Then mark the road at that mark, roll the bike for one tire revolution and mark the road again at the tire mark. Now measure the distance between the two marks on the road.
If your anal about it tire pressure should be set and the bike should be weighted with the rider... Though the 860 doesn't allow for fractional settings so you'll have to round up or down anyway.
 
Gionnirocket said:
To accurately measure your tire...
Put a mark on the tire near the tread. Then mark the road at that mark, roll the bike for one tire revolution and mark the road again at the tire mark. Now measure the distance between the two marks on the road.
If your anal about it tire pressure should be set and the bike should be weighted with the rider... Though the 860 doesn't allow for fractional settings so you'll have to round up or down anyway.
Click to expand...
Your method measures the circumference of the wheel, what you need is the diameter. which is simply the height of the wheel.
 
JES2020 said:
Your method measures the circumference of the wheel, what you need is the diameter. which is simply the height of the wheel.
Click to expand...

You're probably correct... I have that stuck in my head from my old CatEye bike computer settngs

But the 860c does support circumference input and higher speed limits dependant on the controller.
I have mine set to 30mph and it keeps pushing till then
 
Last edited:
Gionnirocket said:
You're probably correct... I have that stuck in my head from my old CatEye bike computer settngs

But the 860c does support circumference input and higher speed limits dependant on the controller.
I have mine set to 30mph and it keeps pushing till then
Click to expand...
I think most programmable controllers have speed adjustments, I have my KT set to the max at 75 km, which is way more than the bike will go.
Even so changing the wheel diameter to a small size will increase the speed above the actual wheel size setting, try it you'll like it.
 
Anything above 25 mph on a fat bike with lower pressure gets a little sketchy.
If you have the pressure too high the off road ride is harsh.
 
jam66 said:
Anything above 25 mph on a fat bike with lower pressure gets a little sketchy.
If you have the pressure too high the off road ride is harsh.
Click to expand...
I have a hard tail mountain bike with 2 inch wheels, fully inflated, aggressive knobbies on the rear and hybrid on the front. I have had it to 32 mph on the road and it felt very stable.
On the dirt I usually stand for bumps at high speed. I just added a nice little addition...a suspended seat post which is amazing. Now I can ride over small bumps with no spine bashing whatsoever. I was thinking of getting a hyper paded seat but now I don't need to : ) For $39s it's a absolute necessity for unsuspended frames.
 
JES2020 said:
I think most programmable controllers have speed adjustments, I have my KT set to the max at 75 km, which is way more than the bike will go.
Even so changing the wheel diameter to a small size will increase the speed above the actual wheel size setting, try it you'll like it.
Click to expand...

Interesting.
But first I'd see what happens with a setting such as 35mph (56km) as I like the accuracy of the mileage and speed readout.
That said at 30mph (48km) I'm rolling pretty fast and really wouldn't want to go faster without more protection and a more wide open road than the railtrails I ride.
And if your controller supports it a setting of 99 on the 860c is unlimited speed.

@jam66... Yes... Let's be careful out there ;)
 
Gionnirocket said:
Interesting.
But first I'd see what happens with a setting such as 35mph (56km) as I like the accuracy of the mileage and speed readout.
That said at 30mph (48km) I'm rolling pretty fast and really wouldn't want to go faster without more protection and a more wide open road than the railtrails I ride.
And if your controller supports it a setting of 99 on the 860c is unlimited speed.

@jam66... Yes... Let's be careful out there ;)
Click to expand...
Well unlimited speed is not actually unlimited. Einstein tells us the universal speed limit is the speed of light : )
Hell, as an aircraft pilot I literally can't go too fast !
I had a kit plane that could go 150 mph on four gallons of auto fuel per hour. That works out to about 48.2 mpg no wind. And I still wanted to go faster !
 
JES2020 said:
Well unlimited speed is not actually unlimited. Einstein tells us the universal speed limit is the speed of light : )
Hell, as an aircraft pilot I literally can't go too fast !
I had a kit plane that could go 150 mph on four gallons of auto fuel per hour. That works out to about 48.2 mpg no wind. And I still wanted to go faster !
Click to expand...

Confirmed.
Just tried it with the setting set to 99 and you were right. The bike started to cut power just before hitting 670,616,629mph.
 
No... Seems cryogenic preservation came to be shortly after I left and they all waited for me.
 
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