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chas

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Reply with quote  #1 

I put a 54mm front tire on my cross/gravel bike (rear is 40mm).  Wow, what a difference.  Front forks tend to have lots of room, so there is often the option of going monster cross big on the front – even if the rear won’t go that large.  It really changes the personality of the bike.

 

I ride 28mm on the front on the road, and 40mm grave. The 54mm (Thunder Burt) really makes the bike feel like a ridged mountain bike, adds more traction, increases trail, adds to stability, slows down the steering, adds a lot more cushion (low 20's psi), makes the bike feel more like a truck, and a makes soft sand much more rideable.

 

Speed wise it rolls well, and can cruise on a flat road within 5-10% of the speed of the 28mm race tire.  It also accelerates like a mountain bike (i.e. slowly with effort) and has a bit of a gyroscopic effect. It tends to slow everything down, which is good for gravel.

 

I have it on a 700c wheel, but I think clearance wise and to match the 700x40c tire a 650b 54mm version would be better.  But on my bike the slacker head tube angle by the large front wheel isn’t a bad thing. 

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widerisfaster

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Reply with quote  #2 
Thanks for sharing your experience. Coming from a road bike, using different tyres front and rear was foreign to me, but it make sense off road.

I've just been looking at the Thunder Burt 650B x 2.1. I have clearance for 2.1 at both ends, but I'm trying to decide between the Gravelking SK 650B x 48mm (1.9) and the Thunder Burt 2.1. Is there such thing as too much tyre?

It seems once you go above 48mm/1.9" the tyres are more open spaced chunky MTB knobs than gravel tread patterns.

There is no such thing as the perfect tyre for everything, but I think for where I ride, the Gravelking tread pattern will be faster rolling on the hard pack, and provide enough grip in the looser gravel, and maybe keep the handling nimble enough. 


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HollyBoni

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Reply with quote  #3 

Quote:
Originally Posted by widerisfaster
Is there such thing as too much tyre?


In terms of tread pattern and construction/reinforcing sure, but width... Not sure. It was proven plenty of times that just because a tyre is wider it's not necessarily slower. 

Personally I would go with the Thunder Burts to run as low pressures as possible (comfort). I have GK SKs and I love them but still.

 

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chas

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Reply with quote  #4 
We need to convince them to make a 650b furious fred
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HollyBoni

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Reply with quote  #5 

G series or the Continental Speed King II?

https://www.bicyclerollingresistance.com/mtb-reviews/continental-speed-king-ii-racesport-2015

https://www.bicyclerollingresistance.com/mtb-reviews/schwalbe-big-one-2016

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