Polo eBay finds/marketplace

If anyone wants to build some cheap lightweight wheels. They seam identical to the xc717. http://item.mobileweb.ebay.co.uk/viewitem?sbk=1&nav=SEARCH&itemId=390680741215

Apparently the 2003 X317 became the 2004 XC717 Disc.

32h

He said lightweight.

This is the Polo eBay/marketplace, lightweight build can >>>>>>>>>>>>>>>>>>>> ;)

Nowt wrong with losing some weight off your polo steed as long as it doesn't compromise strength too much.

I have seen shots go through 36h 26" wheels and I have shot through them too. Running a disc on it? Kinda negates the lightweight build in the first place.

Beagle it!

^^ Based on that argument, 36h requires a disc. Therefore, 32h + disc will save a whole 4 (count 'em!) spokes' weight over 36h + disc.

But discs are heavier than v-brakes... Run a v-brake and a 28h rim...

I thought we were talking about wheel discs (Correx etc.) rather than disc brakes.

I don't care...

we were

Discs need spokes to support them. 32h wheels have larger gaps between the spokes and hence if a shot is hard enough, it will still go through.

Save 4 spokes worth of weight? Drink 1 less beer when you play and you will save more weight ;)

that's crazy talk!

Ballistic extruded polycarbonate... Accept no substitute...

Have had correx split and the ball go through on a 700c 36h before

Drink 1 less beer when you play...
Heretic.

We are talking 26" here...

I lost 5kg since not drinking for Stoptober. Maybe you should give it a try ;)

Corex isn't that great, better than nowt but the ball will still bend your spokes to the shithouse... I'm talking 26 here...

I have seen shots go through 36h 26" wheels and I have shot through them too. Running a disc on it? Kinda negates the lightweight build in the first place.

Bullshit.

is the angular velocity
is the moment of inertia around the axis of rotation
is the kinetic energy

For I, refer to this:

which is the form by which you calculate the total moment for a body, based on the basic I = mr² formula.

Non disc vs disc:

Treating rims as if all the weight was at the eyelet, and abstact a 160mm two-piece rotor to a single point at 60mm radius rather than calculating the distribution...

XC717 disc is 25g lighter than non-disc, eyelets at 270mm
RT86 rotor 115g at 100mm

disc inertia penalty = (115 x 60 x 60) - (25 x 270 x 270)= 414000 - 1822500 = -1408500 g.mm^2

So the braking surface has 4.5 times the moment of intertia of the rotor.

WTF are you on about? We are talking about wheel disc, not disc rotor.

WTF are you on about? We are talking about wheel disc, not disc rotor.

Oh sorry, you waded in with this:

Running a disc on it? Kinda negates the lightweight build in the first place.

...when we were discussing a Disc-brake-only rim. As mentioned above whilst I was composing my expression of how wrong you were, you should have said cover.

Your 700c Velocity Deep Vs are 580g each and have a larger radius. Your opponents will be shooting before you can get back.

I mean correx wheel disc in both posts and your response is even after Chris clarified what we are discussing here.

With regards to your other point, re:

We are talking 26" here...

Please stick to the point? ;)

Bullshit.

For I, refer to this:

which is the form by which you calculate the total moment for a body, based on the basic I = mr² formula.

Non disc vs disc:

Treating rims as if all the weight was at the eyelet, and abstact a 160mm two-piece rotor to a single point at 60mm radius rather than calculating the distribution.....

XC717 disc is 25g lighter than non-disc, eyelets at 270mm
RT86 rotor 115g at 100mm

disc inertia penalty = (115 x 60 x 60) - (25 x 270 x 270)= 414000 - 1822500 = -1408500 g.mm^2

So the braking surface has 4.5 times the moment of intertia of the rotor.
that's good to know em

Right, I'm adding an item onto my list of projects mindmap: inertial analysis of common polo wheel choices. The map only covers about an A2 page so far.

Max Power has already described why 700c is not the right choice for polo.

BMX polo ftw.

BMX polo ftw.

Reductio ad absurdum >>>>>