Everthing you need to know about Wheel sizes & Spokes (ETRTRO/Inches/French Std)

Here's a sweet little fact: 

The first (Geoff Apps-designed) 700C wheeled off-road bicycle was made in 1981.

It's all here, Inches vs ISO-5775/ETRTRO vs French.

Schwalbe :

http://www.schwalbetires.com/tech_info/size_markings

BikeCalc.com:

http://www.bikecalc.com/wheel_size_math
(Best read what is says about it first though)

There' s also this handy spoke calculator here:

http://spokes-calculator.dtswiss.com/Welcome.aspx?language=en

Both need updating for 27.5" wheels, but also note that 29ers or two-niners are mountain bikes and hybrid bikes that are built to use 700c or 622 mm ISO (inside rim diameter) wheels

From https://en.wikipedia.org/wiki/ISO_5775

The Copenhagen Wheel

This wheel uses a combination of sensors to help you ride without the effort you'd normally need...

http://www.bbc.co.uk/news/technology-31643823 

Making the ICE bike

Lifehack: How to ride in the Snow & Ice

Yes, yes, I know that here in the Northern Hemisphee it is very sunny and hot, well of course, it is Summer, but I came across a little something I bookmarked and thought it so awesome, that it just had to be shared before it was forgotten again!

This would be really useful for things like Megavalanche.

Got snow? Just attach some Zip Ties!

LowCost Solution to Keep On Biking | Bike | Gear

Wheel Restoration - Doing it right

Here is an excellent in depth video guide for you if you need to fix your wheels!