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Inner tube & tire alternatives for RW4

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ceoloide:
As many others, my front tire inner tube exploded while parked under the sun for less than 30 mins.

Rad does not have stock on tires and inner tubes, so I am left without bike for the foreseeable future, which sucks.

I followed the advice of other posters here and on r/radpowerbikes and purchased motorbike inner tubes (Michelin Airstop Butyl 18ME for 9?).

They are significantly heavier (530g vs 290g of the stock ones) and are a good third larger, but they seem to fit, though I'd not inflate them past 20-25PSI.

I am also looking at the Kenda 2.75/3.00-18 TR4 inner tubes, and the Michelin 18 MC 2.50-18 in case they are lighter / narrower.

Unfortunately the explosion damaged the tire or was caused by a tore defect, so I'll be looking at a replacement for that, too.

Michelin City Pro / City Extra tires look extremely heavy (>6kg) based on somewhat unreliable data found online. Duro HF918 or similar also look heavy at 2.5kg.

ceoloide

ceoloide:
Similarly to this post on reddit I've measured the tire width and shoulder height, and though I also don't have a caliper for very precise measurements, I get 75mm x 75mm, which roughly equates to a 70/100-18 or 80/90-18 or 80/100-18 or 3.00-18 or 2.75-18.

As a reminder, bicycle tires are measured differently than motorcycle ones, so RW4 tires are reported as 22"x3.0" but the bike wheel is actually a 18" one (as written on it as ETRTO 457mm-45mm or 18"-1.77").

The stock inner tube width measures 65mm or 2.55in when flat, so it looks like a 2.50-18 motorcycle inner tube would fit well, something like Michelin Airstop 18MC - 2.50x18. I purchased a Michelin Airstop 18ME and it fits well, but it's also relatively large at 90mm or 3.54in.

ceoloide:
One additional point of info regarding the tire dimensions: looking at the image below the markings on the sidewall report it to be 76/100-457 M/C 43B MOPED.

76/100 means that the tire is 76mm wide and 76mm tall, consistent with my measurements.

457 is the rim size in mm, which amounts to 17.992" or simply 18".

M/C stands for MotorCycle (same as MOPED), to distinguish from other types of tire usage.

43B indicates the max weight and max speed, with "43" being 155kg, and B being 50 kmph / 31mph.

With the information above it's clear these are 3.00-18 motorcycle tires.

ceoloide:
I found a close match to the spec at a very reasonable price (25?): CST C-916 3.00-18 TT 47P

TT stands for TubeType, as opposed to TubeLess, so it's designed to work with a inner tube.

The speed rating and weight rating are both higher (175kg - 150kmph/93mph), so I expect the tire to be heavier than the stock, but also more durable.

Ddaybc:
That picture of the tire looks like a perfect blend of smooth tread and the ability to be used on sand, gravel and even snow/slush. Good choice for the RW4.

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