- Some of you are wondering,
what is a dirt jump bike?
I like to say it's an over-sized BMX.
You can use it in the skate parks,
you can use it on the street,
dirt jumps, slope style.
I'm gonna walk you through the whole bike.
(subtle rock music)
So I'm gonna start from the
ground and work my way up.
You've got two different sized wheels
when it comes to dirt jump riding.
You've got 24-inch wheels, here,
which is a little bit of
an old school size wheel,
but there are still them diehard fans
that do still use them.
This side, we've got 26,
the most common sized wheel
when it comes to dirt jump riding.
They're super light, very strong,
and they can take an absolute hammering
when it comes to crashing,
or them big jumps.
So, when it comes to tyre choice,
I've gone for an XC tyre.
This is super lightweight, strong,
the tread pattern is low-profile.
I'm running at 60 to 65 PSI,
which helps with rolling resistance,
and the dreaded pinch puncture.
I hope.
Next up, drivetrain.
There's two different kind of cranks
when it comes to this,
but it's all personal preference.
BMX cranks,
durable, cost-effective crank
that allows you to run a 25
tooth chain ring on the front.
Mountain Bike, super slick,
lightweight, strong,
but you're limited to a 30
tooth chain ring on the front.
Pedals.
It's all about flats,
no old clips involved with dirt jumping.
For me, I've gone for
a small platform pedal,
and I've wound the pins out
to give me that extra bit more grip
under my foot.
Brakes or no brakes, that is the question.
For me, I'm running a hydraulic disc brake
on the rear, with an extra long hose
which I've wound around my head tube
to give me that extra bit more flexibility
when spinning the bars or
doing tricks with the bars.
Another option is gyros.
This is a piece of equipment
that runs underneath your stem,
which allows you to spin your bars
freely, without any cables interfering
with the spin of your bars.
So, when it comes down to the heart
of this bike, it's all about the frame.
Generally made out of aluminium,
or chromoly.
It's super light, strong, stiff,
it's a neat little package.
Neat.
So, when it comes to
geometry on this bike,
you have a real steep head angle,
real short rear end,
BB's middle.
Just allows you to throw this bike around
and just get in amongst it, you know?
Flick it about.
Generally, all dirt jump bikes come
with suspension forks.
I'm running mine at a high pressure,
super stiff, but just enough
for those heavy impact landings.
Right, we've reached the top of the bike,
the cockpit, the bar and stem.
Generally, all bars are super narrow,
and stems are super short,
just to give that extra
bit more manoeuvrability
around with those bars.
I'm running my bar length
at 760, and the stem at 40 mil.
So, hopefully that's given you
an insight to what a dirt
jump bike is all about.
If I've missed out anything,
or if you wanna know more about it,
let me know in the comments below
and I'll get back to you about it.
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click right here.
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click here to see our bunny hop challenge.
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