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Old 05-18-2018, 08:03 AM
Googe Googe is offline
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Default Bicycle/ motorbike rims.

Hey all, in the beginning stages of planning a offroad kart. I run a cnc plasma and laser at work and will be cutting all parts myself. I will be attempting to make the kart almost weld free using custom designed parts that bolt together. I want it light weight so will be using thin gauge high tensile steel. First question i have is.. Im Tossing up between mountain bike rims and motocross rims. I've read about people just using a single shaft as the axle and bolting from.the outside, is this strong enough for decent off road action?. Just doesn't seem like it would be up to the task. Was thinking about making a small hub that bolts to the disc brake bolt pattern. thanks for any help.
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Old 05-18-2018, 08:23 AM
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Bike/motorcycle tires are the wrong wheels to use at all... Need proper ATV/offroad buggy wheels for this...
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Old 05-18-2018, 08:38 AM
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Thanks mate, I was wanting high ground clearance and light weight as I will be going into rocky creek type country. Why would they be wrong?, new to all this. Cheers.
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Old 05-18-2018, 08:49 AM
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They don't take side loading well... They're typically not built for those stresses a 4 wheeler imparts upon them.. A bike, they do fine...
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Old 05-18-2018, 08:57 AM
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Thanks mate, had my doubts from the start about load on them. Will do some.more thinking, appreciate the help.
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Old 05-19-2018, 10:12 PM
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I cut a flange at work to try help explain what I meant. I hope the pictures explain better?. Cheers
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Old 05-19-2018, 11:16 PM
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What exactly are you building as in what do you have so far? And with that being said... That wheel is defiantly not meant for off road...
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Old 05-20-2018, 12:23 AM
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All i have so far is ideas, a draftsman and machinery to make the parts. i want a light weight kart. maybe around 125cc. The rims in the pic are for reference. I think motor cross wheels is my prefered option. I have a plan to make the frame from 3mm strenx sheet steel, folded edges for strength. i have access to presses for fabrication also. Just working thrpugh ideas.
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Old 05-20-2018, 01:00 AM
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What have you built so far???.....

and where abouts are you located??
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Old 05-20-2018, 01:56 AM
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I havnt built anything.
located in NewZealand.
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Old 05-21-2018, 07:25 AM
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not even motocross wheels are really suitable..
the problem is the same, they don't take sideloads too well!
(motorbikes lean into a corner thus there's little to no sideload in corners..)
hit a curb with a motorbike and see your rim pretzle in no time...

Such impacts are not too uncommon in offroad driving on four wheels and as a result..
bike wheels (no matter if pedal or motor) are not the best choice.

And as a matter of fact... most (nearly ALL) bike wheels are meant to be supported on BOTH sides of the axle (means the axle itself is rather small mostly)
too small to be left unsupported on the other end at times.

And whily cyclekartists found a handfull of rims that can be mounted to a cycle kart more or less reliably.. those are on road vehicles... hitting a curb or potthole is still not recommended let's say

I think if you pick a wheel you wouldn't want to whack with a wooden baseball bat,
fearing it'd be damaged if you hit too hard.. it's not the wheel you'd want to mount to an offroad kart.

'sid
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Old 05-21-2018, 03:06 PM
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Thanks for the detailed explanation mate, makes sense. Not sure what to do now as ive never found any buggy wheels i like, there all to small and fat, wanted skinny and tall.
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Old 05-21-2018, 05:08 PM
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and that's the issue..
skinny and tall is less likely to withstand sideloads as good as small and fat

but if weight is not much of an issue.. check car wheels...
rims whatever fits the bill.. but older SUV (weren't called that back then..) had rather skinny tyres
often just 175mm wide with some nasty looking profile
a 175/80R16 for example (say a Nortenha MTK2 just cause it looks grunty)
is roughly 28" in Outer diameter and going by it's denomination 17.5 cm wide...
(just under 7")
heavy though.. car tyres.. whaddya do

With that it's about as wide as modern day motorbike tyres and a hair taller

much beefier and much heavier of course.. but it'd hold up to some more serious abuse
(given you don't pick a cardboard rim that is )

'sid
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Old 05-22-2018, 07:05 PM
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Thanks mate, i was thinking about skinny car wheels but might be to heavy for what i want. even looked at space saver rims, there skinny. But will have more of a think, might just have to use the small fat one everyones uses, dont want to though.
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Old 05-22-2018, 07:44 PM
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yeah beauty is in the eye of the beholder...

but once you wreck one of those tall and skinny ones in your average offroad sink
or because you slid off a rock or log...
you know why "everyone" uses small fat ones

To me those bike-style rims always look flimsy and thus not really appealing;
especially not for offroad conditions.

space savers are indeed skinny, but you won't find tyres with offroad tread,
also the tyres are either folded (weak sidewalls -> bad for sideloads)
or low sidewall (less cushioning on frontal impacts also not a good idea offroads)

So yeah pick wisely!

'sid

That somehow reminds me of that french electric 4x4 kart.. what's it called again? SWINCAR?? (google "french spider kart" and you'll surely find something) that had tall skinny wheels *giggle*
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Old 05-22-2018, 08:04 PM
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Thats the buggy ive been looking for for ages!, thanks. agree about the tyres and load limits. I just wanted max ground clearance, thats why i wanted a tall wheel. My biggest problem is following the rules lol.
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