Which one is better? And Can I use it for single speed?

I'm really confused it someone tall me if the speed 110 plus use the stiff and another tall me swing 90 plus use stiff so which one is right?

• Answer:

  This is one of my biggest pet-peeves in golf. They both could be right, with the way things are in regards to shafts... There are no standards when it comes to shaft specs. Well, there's two: weight and length, but those won't be messed with because anyone could set a shaft on a scale and find out its weight or use a 48" ruler to find its true length. Very, very few customers could find out a shaft's actual stiffness, torque (raw or cut? two different numbers, and usually fudged by the manufacturer to be lower), or bend point/tip stiffness. There was a group of people, spearheaded by Tom Wishon, that tried to corral shaft manufacturers into a true "standard" for every spec. They resisted at every turn. So what we get is confusion... One company may say theirs is an "S" flex, but it frequencies out 10+ cycles per minute (CPM) softer than another company's "S". In reality, Shaft A, as it regards to Shaft B, is actually a full flex softer, yet they both say "S"! Making matters worse, manufacturers do this stuff within their own house brands... There's one other thing to address: the golfer's swing. Swing speed is one way to find flex, but the golfer's transition from backswing to downswing should also be looked at. Those that have a smoother, slower, transition may actually benefit from a shaft that's a flex softer than what their swing speed might dictate. Conversely, someone with an aggressive transition may be better off going one flex up from their swing-speed suggested flex rating. What is the average golfer supposed to do? There are people trying to help. Hireko Golf has their DSFI (Dynamic Shaft Fitting Index) and the GolfWorks has their SPF (Shaft Playability Factor). You input information about your swing, and they match you up with shafts that should fit. Tom Wishon has his Shaft Bend Profile software; if you have a favorite shaft, or you find one that fits but might hurt the wallet, the software can find shafts that match the flex profile of said shaft. Golfsmith has their RSSR (Recommended Swing Speed Rating): a range of swing speeds for shafts. For example, let's say a shaft has an RSSR of 90-100mph. You swing 95mph, with a "normal" transition. Said shaft should be a good match for you. If you have an aggressive transition, you may want to find an RSSR that's more in the 95-105 range; for a smooth transition, an RSSR of 85-95 might be better.