I'm now trying Continental's SportContact tyres. These will stand up better to everyday use. |
The main problem, I think, is that they are simply not intended for use on a fast tricycle like the Mango. Sideways forces, especially when braking, are too much for them. On a two-wheeler it isn't possible to put such a sideways force on a tyre, nor to brake with a considerable sideways force on the front wheels without instantly falling off. The rubber was lost right outside our home, as I rode in quickly. A touch on the brakes, the wheel on the inside of the turn was in a skid, and there was a smell of rubber.
Even if I'd not had this problem, I was already planning to replace the tyres. Both Grand-Prix tyres already had cuts in them presumely due to small stones or pieces of glass (I didn't find the cause). This all happened a bit too soon for a practical tyre.
Continental's Grand Prix tyres are fast, but don't like high speed cornering and braking with a velomobile. |
The advertised weight for the SportContact in this size is 295 g, however mine were actually a little lighter at about 270 and 280 g each.
New tyres fitted and ready to go, on a cycle path wide enough that riding an unusual bike is never a problem. |
The maximum pressure stated on the side-wall on the SportContact is 6 bar ( 85 psi ), but the accompanying paperwork attached to the tyre says 7 bar ( 102 psi ). I'm using the higher pressure. I have suspension so don't need the tyres to contribute too much to comfort, and they'll roll faster at the higher pressure.
My rear tyre remains a Schwalbe Marathon Racer. This still barely looks run-in. Actually, it wouldn't have been a bad choice for the front wheels as well.
Update 2016
When my daughter and her boyfriend went touring, they used Continental SportContact tyres.
Tyres and tubes and other nice stuff can be bought at our webshop.