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many years ago, whilst out riding with a Hebden Bridge based bike designer, while following me up a steep climb, he commented that a man built like a grizzly bear needed to run a very wide rim/tyre combo for stability on their bike.
at the time i was running mavic d521 rims, which were quite wide and tough, i then swapped to d729 rims, which did indeed feel better, and lessened the pinch puncture problems.
so back to present, rims up to 100mm, 3'' and bigger tyres, tubless to eliminate pinching.
seems like a ideal combo for a really heavy big rider.
bigger the rider, bigger the wheel, bigger the tyre/air space?
thoughts please.
How much does thee weigh kid?
3" tyre on a 100mm rim might be interesting 🙂
But yes, I'm >100kg and find 4" tyres on 80mm rims just work without fuss. Next step is suspension and 65mm rims to give them more of a trailbike profile. But I really want to try a FS 650b+ bike as that would seem like a brilliantly fun combination. A bit like a Dakar car is probably more driveable and fun to an average person than a group B car would be, it takes all the best bits, then just softens the edges enough to make it work.
How much does thee weigh kid?
a nice 20 stone again. or 129kgs.
[quote=thisisnotaspoon ]3" tyre on a 100mm rim might be interesting
That. You need to be looking at 45-50mmm rims for a 3" tyre.
There's a lot out there now. Ride a few and see how you get on. Or go for the full fatbike experience with 4" tyres - a Surly Wednesday perhaps?
sorry, i didnt mean getting a 100mm rim, just stating that with the availability, the options were pretty good now.
52mm looks ideal.
110kg on 45mm tubeless Dually's.
No problems, running around 12psi for general wafting around.
Gives a nice ride.
Contrary to takisawa I think the hugo is much better than a dually for a bigger load... Certainly I find the Dirt Wizards are much much more burp prone on the dually at lower pressures. Yes I have tried both and indeed still have both.
ALSO... Hugo is a million times easier to set-up tubeless than the dually...
(I really like hugos.....)
And in answer to the op, I really enjoy riding the plus size tyres, never had a go at full fat and only ride hardtails.
I think it's the best of both worlds, good rolling, decent cush etc...
works for me - although have shed about 10 kilos since building my rooster can't quite get down to 12 pis in the rear tyre without smacking the rim occasionally.
We're about the same height etc. i think Ton. I bought an inbred off you years ago. You can take mine for a spin sometime if you want one weeknight evening if you promise to show me some intersting trails.
Its late I can't type and punctuation appears on holiday - emails in the profile if you want
No. B+ have light carcasses - so more burping etc and stability actually isn't that good at the best of times.
The maxxis widetrails will be here soon, so 2.5 minion wide trails, 35mm rims and procore should help heavy riders.
Generally, the bigger you are the more grip you will find with higher pressures. 200lb guys don't need to run sub 20 psi to find grip.
got some flow ex rims, think they are 35mm
what is the largest tyre i can run on them?
You'll fit 3.0" tyres fine.
got some flow ex rims, think they are 35mm
what is the largest tyre i can run on them?
They aren't 35mm internal.
35mm will be fine all the way up to 2.8. Anyway the procore will aid stability and will stop you from dinging your rims and a 950 gram 2.5 tyre is always going to be more stable than a 950 gram three inch tyre.
[quote=Tom_W1987 ]No. B+ have light carcasses - so more burping etc and stability actually isn't that good at the best of times.
What tyres have you been using Tom, and on what rims?
Saw a bloke at mayhem riding what I thought was a 650b+ Nicolai HT but it was that we'll proportioned when he said it was a 29+ bike I was amazed, he was something like 6'5" and it just looked normal.
I've tried trailblazers on 40mm rims and have managed to have a quick go on a 3.0 Nobby nic but was unimpressed by both in regards to stability.
I dunno, they offered more grip and if thats what Ton wants - then sure - go for it. But personaly I wouldn't buy them expecting more stability and by stability I mean less deformation during turns. If you want stability, thick casing, wide rims and perhaps the schwalbe procore thing if you can be arsed to outlay the money and spend time tinkering to get it right.
I was impressed by how fast one lad was riding them at Stile Cop a few weeks ago though - might as well have been on a DH bike.
chronicals on hugo's look good, with flow ex fitted with 2.5 big apples for road pottering.
Going against the grain, I wouldn't go too wide with the rims. There's a point behind which even 3" tyres are squared off by wide rims, so IMO Hugo's are in a no man's land between a narrow fat bike rim and a wide normal rim, ditto rabitholes. Narrower (but still wide) rims give rounder profiles, lower rolling resistance and better cornering grip.
As for stability, it's a product of speed Vs pressure, too much pressure means less grip means less speed means not enough load to collapse the tyre. Too little pressure means too much grip, more speed and the tyre collapses. So somewhere between the two is a ballance. ProCore won't help grip or stability in itself, it just protects the rim/tyre when pressures are low (I.e. you're limited in how low you can go by getting pinch flats before you hit the point of grip/stability).
It does help stability as the 80 odd psi tube helps to support the sidewalls and the tyre is essentially more progressive.
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I don't see how that loss of internal volume and internal tyre wouldn't aid with stability.
52mm Hugo rims on my Travers 29er+ tubless with Knards are perfect for me but I'm just over 12 stone and about a foot shorter than you Tony.
Just fitted it with a Lauf Carbonara for a bit of extra comfort in my old age
I don't see how that loss of internal volume and internal tyre wouldn't aid with stability.
Because the pro-core inner tube isn't pushing on the sidewalls, and the volume of a tyre is so many times bigger than the volume that's deformed against the ground that the force required to deform the tyre isn't following Hooke's law (force =/= modulus x deformation), so reducing the volume by ~1/4 (probably) doesn't make a significant difference.
The force required to deform a tyre is dependent on the area deformed (tyre pressure x area = force), the more you push on the tyre, even with a small initial area) the wider an area is deformed as the carcass is pulled in around the area you're pushing. That's why a 4" fat bike tyre actually feels quite supple over small pebbles/cobbles (because it's deforming over them with a force of 10psi x the area), but feels relatively harsh when you ride it up a kerb (not as harsh maybe as a 2" tyre at 30psi, but harsher than maybe expected based on how soft they feel over a rough surface.)
If you had the luxury of a pit crew and an uplift and could ride the same track repeatedly you could drop the pressure with ever increasing grip until you reach the point at which your rising corner speed and decreasing tyre stability meet and the tyre rolls over. If that happens before a low enough pressure that pinch flatting becomes an issue then ProCore wouldn't do anything. Whereas if you pinch flatted before you reached the point at which the tyre became unstable then you've not reached the optimum grip for that tyre/track/rider.
It might have the side benefit of preventing burping or the tyre rolling off the rim completely meaning that if the tyre was unstable then it's less of an issue (you'd just mess up one corner), but that's different.
To keep it reliable you would have to run such high pressures that you defeat the point and wipe out any of the benefits of + size tyres. 25psi in a + tyre is a harsher ride than 25psi in a regular tyre. This is also my experience of a lighter rider riding aggressively on them.
I'm heavier than the lot of you and smash berms out on 2.4" 650b chunky monkeys.
With a bit of Jedi training I've been reveling in full speed cornering. Can't say I ever burp tyres nor suffer with pinch flats (I run tubeless).
Can't help but feel the efforts being mentioned in this thread are a bit overkill?
I run my fat bike on 80mm/4" tyres at around 11/12psi front and rear and have also been looning about in grip. Off camber grip is brill.
To keep it reliable you would have to run such high pressures that you defeat the point and wipe out any of the benefits of + size tyres
Complete bollox... I've run mine as low as 10psi reliably and I'm a big guy...
Bacondoublechee you must be doing something wrong