Gate closer Posted July 29, 2019 Posted July 29, 2019 Is there markings on MTB tyres that indicate maximum load and speeds? Previous weekend clocked 85km/h and after the fact wondered if the tyres should be ridden at these speeds, bearing in mind I'm not the lightest person around.
MudLark Posted July 29, 2019 Posted July 29, 2019 Most manufacturers provide neither a load nor a speed rating for bicycle tyres. Schwalbe often have load ratings for their tyres. The only tyres for which load and speed ratings are mandatory are fast e-bike (bikes providing assistance in excess of 25 km/h) tyres.
Long Wheel Base Posted July 29, 2019 Posted July 29, 2019 What gearing do you have on a MTB that you can do 85? Or was it a seriously steep descent?
Gate closer Posted July 29, 2019 Author Posted July 29, 2019 I have a 38 up front and an 11 at the back but ran out of revs long before we got to 85. It was a very long downhill just outside Underberg.
Longbarn Killer Posted July 29, 2019 Posted July 29, 2019 You've got guts. I'm scared hitting those speeds on my road bike on a smooth road, let alone on a MTB.
Gate closer Posted July 29, 2019 Author Posted July 29, 2019 You've got guts. I'm scared hitting those speeds on my road bike on a smooth road, let alone on a MTB.It was a smooth road and maybe its stupidity hence the question about speed and load ratings.
Spoke101 Posted July 29, 2019 Posted July 29, 2019 We fairly regularly get to those speed on the MTB's on one of our loops tar sections.The record stands at 99.8km/h with a slight tail wind Edit: Never seen or heard of tyre issues due to speed.
MudLark Posted July 29, 2019 Posted July 29, 2019 Speed ratings are primarily a function of the centrifugal forces on the tyre. Bicycle tyres simply do not weigh enough or rotate fast enough for these to become an issue.
porqui Posted July 29, 2019 Posted July 29, 2019 85 and 99.8 km/h on a mountain bike eisch !!! Top speed on my road bike coming down Ou Kaapse Weg with howling south easter was 91km/h.Never again !!
BaGearA Posted July 29, 2019 Posted July 29, 2019 yus you people are brave highest i've got is 83 and that scared me enough to never do it again
Me rida my bicycle Posted July 29, 2019 Posted July 29, 2019 What gearing do you have on a MTB that you can do 85? Or was it a seriously steep descent?having lekker wheels and being lekker heavy I easily run past 85kph on the road between Meerendal and Hoogekraal and that's with fat 2.35 Nobby Nic's.
Long Wheel Base Posted July 30, 2019 Posted July 30, 2019 having lekker wheels and being lekker heavy I easily run past 85kph on the road between Meerendal and Hoogekraal and that's with fat 2.35 Nobby Nic's.I have hit 101kph on the tandem. Last stage of the kremetart on the only descent of that stage. We were pushing hard though with 56x11 gearing. My helmet was lifting off my head. I don't know how my glasses stayed on. I wont lie, it was scary. I won't do that again by choice but if it's a race I will do what is needed.
MudLark Posted July 30, 2019 Posted July 30, 2019 It sounds to me like a whole lot of people should be worrying about their brake systems rather more than their tyres! :-)
Gate closer Posted July 30, 2019 Author Posted July 30, 2019 It sounds to me like a whole lot of people should be worrying about their brake systems rather more than their tyres! :-)That just made my day and you are 100% right
Super Sywurm Posted July 30, 2019 Posted July 30, 2019 85 and 99.8 km/h on a mountain bike eisch !!! Top speed on my road bike coming down Ou Kaapse Weg with howling south easter was 91km/h.Never again !!My top speed was also aat Ou Kaapse Weg, 76km/h.
Recommended Posts
Archived
This topic is now archived and is closed to further replies.