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Elevated chain stays came in around 1989 on mountainbikes from the USA. It was a trend that hung around for a couple of years but then didn't really last to the present day. In theory they give extra mud clearance on and shorter chainstays meaning more climbing control. Poorly made frames can leave you with extra flex around the bottom bracket when you put the power down.

The bikes look pretty cool so if you can get hold of one for a restoration project there won't be many other similar ones around.

One of the early innovators in this field was Alpinestars - From their advert for the Al Mega XT...

"EOS" Elevated Oversize System, the "secret" to the system is the sum of its parts. What makes our system really work is just that - it is a totally integrated system. Mountain Bike Action said "Elevated and Oversize were 1989's top innovations". But if not combined with the right geometry and the other key elements of the complete bike they are as worthless as most of the past hype you've read about them. EOS incorporates the best of hte past while defining the Mt Bike of the future.

I think we've made our point. EOS is a totally integrated system. If after all this you think we're trying to take you for a ride... you're absolutely right! It's the only way to feel how good it really is.

Elevate Your Performance
Our oversized 15.9" chainstays break the 16" barrier in a big way. Everyone dreams about a climbing edge, We've just created yours.

Oversize Your Thinking
The goal is to maximise the properties of the tubing in a frame that is as light as possible while maintaining strength and rigidity. Our special oversize tubing capitalizes on the optimum ratios between rigidity and weight.

Steer Clear
The only answer to a total system is a complete redesign from the tires up. The combination of our new Megasized Aluminium fork with the megalise alumunium steam and 7005 series alumiium oversize handlebars gives true meaning to "Lighter, stronger and quicker"