new Vredestein HPV 40-406 tyres

I examined the tyres of my Quest today. There was a sort of wave in the right front tyre; maybe one of the two woven layers was torn ? This tyre had rolled 4200 kilometers and it seems that that is the distance it will serve my velomobile reliable.

I have checked the pressure weekly and seldom had to add some air to keep the pressure at 6,5 bar. It is clear that the steering front-tyres under a velomobile are undergoing a war of attrition when turning at high speed on the stony cycle paths.

Normally I’m a easy-going cyclist who loves the comfort of a fully fairing and most cycling paths during my commute are made of smooth and silky asphalt. That is why I put comfort and reliability before speed. The HPV’s at the front gave me a feeling of trust when steering on winding paths and the Schwalbe Marathon Extreme at the back wheel never broke out or slipped away. I think the Marathon Extreme can do another 4000 kilometers 😉

Authority’s on aerodynamics have written that the resistance of a racing bicyclist is mainly due to air resistance and only a small part due to rolling- and drive resistance. Because the ideal fairing of a Quest is already reducing the air-resistance to the practical minimum, it becomes an impossible story to reduce the rolling resistance at such a level that it can be felt when cycling. I decided that the comfort that the wide HPV tyres gave me the last 4 months (4200 km’s) is more important to me than the minimum decrease of speed. They were not 100% puncture resistant, but I reckon that once per 2000 kilometer is acceptable. There is a nice article written in CYLINGNEWS ; they explain very clearly the logics of rolling-resistance here. When reading; be aware of the fact that the wheels of a Quest are inside the fairing !

So I phoned Velomobiel.nl today and ordered two new Vredestein HPV tyres. Ymte said he would send them immediately by package-post…….

The story continues here.

Published by wim harwig

too old to die young, but still making love and not war

2 thoughts on “new Vredestein HPV 40-406 tyres

  1. Authority’s on aerodynamics have written that the resistance of a racing bicyclist is mainly due to air resistance and only a small part due to rolling- and drive resistance. Because the ideal fairing of a Quest is already reducing the air-resistance to the practical minimum, it becomes an impossible story to reduce the rolling resistance at such a level that it can be felt when cycling.

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  2. Keep in mind that the XRs are a little pricier, but apparantely they last longer. The Pluses have done over 6,500kms, and the rear is only half worn, and the front one third worn. If the XRs do better than that, I’ll be very impressed!

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