Obviously car / motorcycle tyres have speed ratings but does anyone know if bicycle tyres are rated or whether they're even tested?

I picked up a 1920's sidevalve engine and fancy building a something based around a boardtrack racer. As you can see from the example, they were often little more than pushbikes with an engine. Most ran wheels / tyres of a larger diameter than is readily available today but bicycle tyres of the correct size could be obtained. It wouldn't be the fastest or heaviest thing in the world but would you trust a pushbike tyre at 70mph?

I might trust it at pushbike weight. Not sure I'd risk it with an engine installed. Ebike tyres are now a thing and are tougher than normal. Might be worth looking at?

Ooh good call Colin. I'd not considered those.

Bearbonesnorm wrote: ↑Thu Jul 08, 2021 8:54 am would you trust a pushbike tyre at 70mph?

It's not the tyres I'd be concerned about .

https://www.youtube.com/watch?v=rTfu0hjVtzE&t=15s

Spoiler: luckily he only ends up with some broken ribs etc

They were descending the Ventoux at around 100km/h yesterday and nobody died as far as I know. A fully laden tourer probably doesn't weigh much less than that Harley so some Schwalbe Marathon touring tyres should work.

no because whilst you could get way with it for short priods of time - 15 minute descent- you are not going to get great life from a tyre run at higher speeds all the time. Therefore IMHO there is high chance of a fail and the fail will likly be catastrophic for the tyre and the person sat on the bike

Will ebike tyres not just be for heavier bikes/loads rather than faster tyres? - Bit like van tyres are designed for weight not x 4 the normal speed

I doubt it's the right thing really but is it the Kirin where they have a (v.expensive) little motorised bike that leads the riders out?

oh good shout that I lik that suggestion - not sure what their top speed is thuogh - its called a derney bike FWIW

Depends whether you want it to be road legal, or just something to take to shows on a trailer.

Road (motorbike) tyres need the correct approval stamps on them, so no you can't just stick mountain bike tyres on them.

In terms of usefulness, Avon do the speedmaster classic tyres in 21" and I'd hazzard a guess that's what is on that bike (bear in mind motorbike tyres are the rim size, so a 21" rim is about the same size as a 26" MTB rim, and a typical 90/90 classic tyre makes it roughly the same size as a fat bike.

Mates fiddling about. Friend of a friend built his own based around a HD engine.
I asked about the tyres.
I guess it's just a narrow moto tyre.

Looks fun

Midnight break in to the velo drome, do some laps with such a beast sounds similar to riding a bike with mud tyres across a green.

Yeah... lots of fun

That looks perfect to knock your teeth out and clean any clinging chug-nuts.

I salute the madness

From Schwalbe:

For speed e-bikes you need a special approval for the tyre equipment. Tires with ECE-R75 authorization valid throughout the European Union are the simplest solution in this case. All of our Energizer tires have the mark of conformity and are
approved for vehicles up to 50 km/h.

Assume there's a fair safety margin built in there.

Then again, you've got 110mph on a set of Contis. Setup's a fair bit lighter than a moto mind: https://www.cyclingweekly.com/news/late ... ike-118329

Avon do the speedmaster classic tyres in 21" and I'd hazzard a guess that's what is on that bike

Sppedmaster's too wide and they're most certainly bigger than 21" rims.

I'm thinking I might have found some 2" x 23" Conti's designed for 'motorised bicycles'

All very sensible and good advice but a set of fat frank’s would LOOK nice

I love old board trackers, on a sensible note
These might help you stay alive a little longer

https://www.wwag.com/cgi-bin/WebObjects ... =%21136911

Bloody hell Steve, they're not cheap. They're also 21", the Conti's I saw were 23" and £30 each

Bearbonesnorm wrote: ↑Thu Jul 08, 2021 1:54 pm Bloody hell Steve, they're not cheap. They're also 21", the Conti's I saw were 23" and £30 each

Ooo didn’t notice the price ouch! Still they are retro do obviously worth the price

The VMCC will sort you out for tyres for that but spendy - i.e they make fat bike tyres look cheap!
If you let me know the sizes I'll ask a vintage bike 'expert' (a good mate who knows his stuff) to see what he can come up with.
P