While shopping for new tires on my bike, I saw that some dealers had a specific section for e-bike tires, where the various brands production for e-bikes was present.
Why do e-bikes need dedicated tires?
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They don't need them but they are good to have. I have an e-bike that I use as a daily commuter. Here are my thoughts:
All in all, I'm still on the original tire which is a regular tire. I'm on the tail end of its lifetime which has only been about 1/3 that of a regular tire. I will replace it either with a beefy "regular" tire or go with one from an e-bike line. I think the actual difference between the two (beefy regular or touring and a e-bike tire) will in reality be minimal.
Update 2018.7: I ended up replacing my rear tire ahead of schedule due to a sidewalk blowout. I’m not actually sure if it was natural wear or if the bike was shivved by a thief. Replaced with a tire from an ebike tire line.
TL;DR: Ebikes require a strong, hard-wearing, high speed, puncture resistant tire. These are also roughly the same requirements as touring tires so some vendors are labeling their touring tires as "ebike ready."
According to Schwalbe at https://www.schwalbe.com/gb/e-bike.html
For standard pedelecs with pedal assistance up to 25 km/h no specific tyres are stipulated by the legislators. But the loads and average speeds of these bicycles are also higher than in the case of normal bicycles. We therefore recommend only certain tyres as “E-Bike Ready 25”. Primarily, these are the tyres of the Marathon and Energizer series as well as the comfort tyres Big Apple and Big Ben.
I call BS on this. 25km/h is not a high speed, nor is the extra weight significant compared to the weight of the rider. Compare this to touring bikes. A touring bike will generally be expected to ride at this speed (less than 16mph) and the luggage will exceed the weight of a motor and battery - but nobody makes touring bike tyres that are made due to the expected "high speed".
In brief - "sales and marketing"
Changing tubes/tyres on an ebike can be more awkward, especially on the powered wheel, plus ebikes tend to attract less "mechanical" riders than regular bikes, being a gateway ride.
So an ebike tyre will be a marketing term for higher puncture resistance and lower rolling resistance, and probably in the wider sizes to cope with the extra weight.
They won't be cheap either, because ebikes aren't.
A regular bicycle tire can be just as sturdy and last just as long under more stress by a regular rider. The joke I have heard among cyclists involve a newcomer to a bike race such as RAGBRAI with an electric bike who inevitably falls behind (and is surprised by this) because regular cyclists (not even pros, just people who ride daily and are serious about cycling) can frequently output more watts on a consistent bike than the legal limits of an electric bike, or at least outperform on stretches where the electric has trouble and falls behind.
So, an e-bike may or may not need "dedicated" tires. But... eBikes are not marketed towards people who are interested in putting in a lot of exertion in their ride. Those people don't need electric assist.
While the question does not say what "dedicated" means, there are a couple of possibilities. One is that, being marketed towards people who are more interested in getting from point A to point B economically which a bit of fitness thrown in on the side, it can make sense to sell "niche" or "proprietary" tires which are optimized towards that goal. These tires can be cheaper to make, at the expense of the second point, weight. But the rider can easily tolerate this since the bicycle is motor assisted. Because of this trade-off a heavier tire can also be made tougher to last longer to match the target market of people who don't want to be on the side of the road changing a tire.
I ride a regular bike (Trek Fx7.2) and an eBike (Giant Quick E+) in casual fashion (ie not superfit or above average). The Giant weighs about 10kg more than the Trek, but since riders vary over 20kg it can't be a weight issue. The Giant is limited to 25km/h assistance which means I very rarely get over 30km/h (Weight/motor/big tyres makes it difficult), whereas I can cruise at 30km/h+ on the Trek (for limited amounts of time on the flats). So it can't be a speed thing either. Based on this I think it's just a marketing gimmick. Tyres are either built for durability (slower, heavier, more puncture resistant, long lasting) or performance (fast, light, easily punctured, limited life). I can't see how an electric motor changes any of that.