19 vs 21 inch wheel

[ebikeFan1234]

Hello - I have this Enduro Ebike with 19 inch road tyres. Paired with extremely torquey QS 273 5T motor. 20kw peak power. I ride 95% on road/bike trails and little bit off-trails. It’s so amazing how this thing can take any hill with ease. Extremely torquey motor which translates into great acceleration in 0-50 mph range. That’s where I stay mostly

I am 6 ft tall and feel that the bike could be a bit higher. Sitting on it feels like a moped. And I would like to feel more like MTB. Current seat height is 33 inches. Thus considering a new bike with 21 inch wheels. It would raise the seat height a bit. What would be the other implications, would the feeling of torque drop substantially? Pls advise

 

[E-HP]

The simple math would be a 10% drop in torque and maybe a small increase in top speed. In my opinion, it's better to have a comfortable bike, even if it results in a small sacrifice in performance.

Edit: correction to the above, 10% drop in thrust, not torque.

 

[AussieRider]

You could raise the seat height with a longer rear shock & maybe lower the footpegs.

AussieRider

 

[Chalo]

Why does that dumb little motorcycle have pedals? Nobody is fooled by them. If you run afoul of the law, it's just like any other unregistered motorcycle.

 

[E-HP]

You could raise the seat height with a longer rear shock & maybe lower the footpegs.

AussieRider

Maybe replicate the geometry of a small adult sized motocross bike, like the Yamaha YZ125. Looks like by raising the seat height about 4 inches, and replacing the bottom bracket with foot pegs that are located about 1" lower would get pretty close. It has a 19" wheel on back and 21" on front, and has a standover height of 38.6"

2022 Yamaha YZ125

If there was ever a class for young aspiring motocross racers, 125 two-strokes are it. Yamaha is the sole Japanese company still carrying the 125 two-stroke torch.

www.cycleworld.com

 

[bananu7]

The issue with that is that all of the hub motor steel homegrown frames have absolutely horrendous geometry. I don't believe it's possible to turn it into a full-size adult motorcycle. Even things like KTM Freeride-E feel toyish in comparison for someone over 6ft. Wheelbase, swingarm length, suspension stroke etc. are all comparatively smaller and can't be compensated for just by wheels alone.

Rear 19" wheel in a typical MX size is 100/90/19, which is just a smidge smaller than the 80/100/21 front. You seem to already have moped tyres - maybe try real high profile 19" motorcycle tyres, that could give you diameter (and height) increase on par with taller rims. I'm afraid that even that won't be satisfactory, if indeed what you want is a vehicle meant for riding as opposed to pedaling, for a full-size adult male.

 

[Joel’s 12KW Bomber Clone]

A 1.6x21 moped wheel with 80x100 21 tyre works well for tall guys. Rear is 1.6x19, 80x100 19. My frame is the big frame version for a 72v 60Ah li-on battery and Sabvoton 72200. The guy I bought the bike off was taller than me. He was around 6'4. I'm 6'1. I changed the OEM short handlebars to long Diety handlebars, and the long stem to a short stem to bring the bars in closer.
My bike is big and long. Good size for adults.

 

[OlderGiantFan]

I wouldn't call that a bicycle, even with the pedals, it's an electric motorcycle. Changing wheels? Complicated complicated. Just have a couple of inches of padding added to the seat as suggested above, or pull off the seat and see if there is some way you can easily raise it 2 or 3 inches. The fact that it doesn't lock in at the front with a tang means it's probably just held on with 4 or so bolts. Get longer bolts and thick rubber spacers.