Is it possble to covert 26x4 to 3 onch tire and rim combo

[PCeBiker]

I just sent them another asking about a 29 as I don't see anything wider than 24mm width id on their website.

What about asking them about a 27.5" rim?

Maybe they know of a better option than what's on my ebike?

That's the rabbit I jumped in to and didn't find anything.

 

[Marcela]

Comparing the 27.5 x 2.3 to the 29 x 4, the height difference didn't look to be more than a little over an inch, and figure to lose 3/4" height on the bike. Interestingly, the pedal height was 1" higher on the 26x4 tired bike, so dropping to the 27.5 is going to put the pedal height in the range of the other bikes and make the ground reach easier. The way it is now the seat has to be way too high to make pedaling normal and touching the ground is tip toe. Dropping it down an inch isn't going to hurt anything.

This pic makes the closer tire appear larger.

 

[Marcela]

Velocity dually 650B with the 39mm id rim $170
Schwalbe pick up 27.5 x 2.6 $60

The dually also comes in the 26 and 29 same 39mm id rim if a suitable tire could be found but the 27.5 2.6 is real close to the 26 x 4. The 2.6 tire is available now and the 2.35 is not. Wonder what the weight rating difference is between the 2.35 and 2.6 if any. I figure to need 300 lbs carry capacity for the rear.

 

[PCeBiker]

Velocity dually 650B with the 39mm id rim $170
Schwalbe pick up 27.5 x 2.6 $60

That's It !!
That's Exactly what I was looking for !!

It's got a wide rim, with a low profile (longer spokes).
The spoke holes are staggered around the convex rim, so the spokes are slightly angled towards the motor and "closer" to the motor (less reach, and angle) because the holes are towards the sides of the rim.

Both of those things should really help with the Shitty angle of the spoke heads at the motor as well.

That rim was built to do exactly what we want for our fat motors.

The rims are all custom built with just a few in stock, but that means that you choose the spoke hole count, but I didn't notice a choice of spoke hole gauge, or whether the valve hole is drilled for presta or Schrader?
I would assume it's drilled for Schrader because that's kinda the standard for the fat and semi-fat North American market.

If you go tubeless, flats are Easy to fix, just plug the hole (just like a car tire) pump it back up and be on your way.

That saves weight on the wheel as well.

If you go tubeless the valve choice doesn't matter much, because it's not attached to a tube that has to be properly sized.
Fat bike stuff is normally Schrader though, and I kinda like the larger valve.
(Presta works but it harder to get tube sealant through the valve)


I'm guessing that the spoke and nipple choice isn't all that critical with the Dually rim, because the spoke angles should be Way Better?

Maybe not "standard generic" but I don't think we'd need top of the line (my 12 gauge spokes are just standard spokes)


My Voltbike used the wrong rim. (I should file a grievance. )

It's quite expensive though, so I'm gunna wait for the rest of your parts list, and your opinion about the finished product before I start buying stuff.

I also have to try and take some accurate measurements of my unlabeled proprietary "Das-Kit" motor to make sure that it has the same specs as my Bafang motor.
I would think that fat motor measurement specs are standardized.
(They all lie about what’s inside the motor casing, but that's a separate issue. )

 

[RunForTheHills]

On the Endless Sphere forum, it is has been discussed that it is almost impossible to get sufficient tension on a 12 gauge spoke on a bicycle rim without risking cracking the rim. If you search for "bicycle rim 12 gauge tension" you will find the discussion.

For this rim in particular, the maximum tension they recommend is 130kgf:

https://velocityusa.com/products/dually-rim-27-5?variant=40783711207503

"We recommend building to spoke tension between 110kgf and 130kgf."

 

[Marcela]

On the Endless Sphere forum, it is has been discussed that it is almost impossible to get sufficient tension on a 12 gauge spoke on a bicycle rim without risking cracking the rim. If you search for "bicycle rim 12 gauge tension" you will find the discussion.

For this rim in particular, the maximum tension they recommend is 130kgf:

https://velocityusa.com/products/dually-rim-27-5?variant=40783711207503

"We recommend building to spoke tension between 110kgf and 130kgf."

Interesting, I missed that. Good point to know. How does that convert to in lbs. I tried a convertor and 110 kgf converts to something like 240 lbf but that doesn't tell me anything. I perused the endless forum torque topic. Lot of things a guy can do, few are going to get the best results.

 

[Marcela]

That's It !!
That's Exactly what I was looking for !!

It's got a wide rim, with a low profile (longer spokes).
The spoke holes are staggered around the convex rim, so the spokes are slightly angled towards the motor and "closer" to the motor (less reach, and angle) because the holes are towards the sides of the rim.

Both of those things should really help with the Shitty angle of the spoke heads at the motor as well.

That rim was built to do exactly what we want for our fat motors.

The rims are all custom built with just a few in stock, but that means that you choose the spoke hole count, but I didn't notice a choice of spoke hole gauge, or whether the valve hole is drilled for presta or Schrader?
I would assume it's drilled for Schrader because that's kinda the standard for the fat and semi-fat North American market.

If you go tubeless, flats are Easy to fix, just plug the hole (just like a car tire) pump it back up and be on your way.

That saves weight on the wheel as well.

If you go tubeless the valve choice doesn't matter much, because it's not attached to a tube that has to be properly sized.
Fat bike stuff is normally Schrader though, and I kinda like the larger valve.
(Presta works but it harder to get tube sealant through the valve)


I'm guessing that the spoke and nipple choice isn't all that critical with the Dually rim, because the spoke angles should be Way Better?

Maybe not "standard generic" but I don't think we'd need top of the line (my 12 gauge spokes are just standard spokes)


My Voltbike used the wrong rim. (I should file a grievance. )

It's quite expensive though, so I'm gunna wait for the rest of your parts list, and your opinion about the finished product before I start buying stuff.

I also have to try and take some accurate measurements of my unlabeled proprietary "Das-Kit" motor to make sure that it has the same specs as my Bafang motor.
I would think that fat motor measurement specs are standardized.
(They all lie about what’s inside the motor casing, but that's a separate issue. )

It's either that or the DT Swiss U663 with the 30 mm rim width and the Schwalbe Pick Up in 2.3 which is shows out of stock at the moment on their web site. Haven't made any decisions yet. Both the 30mm and 39mm rim overlap in tire useage. $500 for a wheel change is kinda expensive dive to take. I was hoping you would be the first. I missed that Velocity rim was asymmetric, was hoping to stay symmetric.