Does anyone know how you figure out what size saddle you need?

Im looking at the alias, but dont have a clue which size i need  

Get a close friend to measure the bones in your arse cheeks. Not quite as accurate as the seat they get you to sit on but near enough that I knew I needed the 143 width

Everyones a 143 on a MTB?

Still say Charge spoon, had several spesh saddles and relegated latest to my commute bike as it creaks, started doing it about 3 months old.

Bought and sold almost straight away an Alias it is a shite saddle for off road as when you drop off the back your shorts hook up on the corners of the V groove when trying to get back on the saddle. 

Sorry for dropping in but XCman do you have the cro mo or ti rail spoon?Is it worth price difference?Leather or vinyl?

Getting one as tried and really liked. Comfortable enough and easy for getting off to ride back wheel 

Quinny 

Cro Mo is the one I have and its hard to fault at the price they are Synthetic leather on the cheap one. Thinking on getting the leather/Ti one for my road bike.

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I thought the whole point of the different width saddles was to do with the different widths riders have between the bones they sit on and has little to do with the type of bike. That's what was stated in the original advertising. Why else woud they suggest getting measured if the answer was '143 for mountain bike'?

 The quote on the Spesh website is 'Saddles come in multiple widths for a tailored fit, based on your 'sit bone' measurement.' no mention of the type of bike there

XCman "Red Stumpy" wrote (see)

Quinny 

Cro Mo is the one I have and its hard to fault at the price they are Synthetic leather on the cheap one. Thinking on getting the leather/Ti one for my road bike.

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Quinny hope you like it whan you get it, I'm just going to put mine to good use for a couple of hours.

Easier buying a charge IMO as I dont know how the Fcuk you would measure your arse

and as to why you would want a wider one for MTBing lord knows.