they are different because they r dirrent componies and so they make different clubs.

what how cares golf sucks and is the lamest thing ever

If the clubs meet the rules of golf they are allowed to be used on the tour. whether or not they have tour in their name or not. as to the differences......http://shop.callawaygolf.com/Product.aspx?cid=46&CS_ProductID=irons-x- 20-tour&iW=0 has all the specs. Oh and they cost about a 100.00 more

This best answer that I can give it to have you go to the Callaway irons web page (see the link below), then move your mouse pointer between the X-20 and X-20 Tour, this will show each of the many differences between the two.

I believe the answer you're looking for goes something like this...."tour clubs" would be clubs that the company who makes them would like the pro's to play. In the olden days, before callaway, it was called oversized and regular clubs. Callaway produced the Big Bertha's to compete with Wilson, Nicklaus, Titleist, and to an extent the newly renovated Taylor Made brands. But Callaway saw an extention of the market that he could exploit, namely the middle class to rich guy who couldn't swing a club to save his life, but just had to have the top of the line stuff. Throw in a little pomp about how these irons will help you because they're bigger and BOOM....golf equipment burst of the 90's.

So today, the norm is mostly about oversized clubs that the normal guy can create good shots with. Where as, the tour model is smaller and you can work your shot with it better.

Does this mean that only a tour player will play tour irons and vice versa? No. I play Hogan Apex FTX, which could be considered by some to be a half pro-half "normal" style of club. There are also some very good amatuer players playing Titleist DCI irons and the like. Some pros also use a non-tour model club, for any number of reasons.

Mostly, it's about comfort. The more comfortable and confident you are standing over the ball the better time you're going to have playing the game. The equipment companies are just beginning to grasp that and all that it promises.

Well the two clubs you mentioned are both retail clubs. The X-20 Tour is designed for a better player because it has less offset and sits squarer. The tour name is just the model, nothing to do with tour. The clubs tour players use are usually clubs you can't find on the retail market, or won't see them for a long time.

Most testing for clubs that eventually end up in retail is done on the various tours. However, there are some clubs that you see on tour that are the same as retail. The only difference is the custom work that goes into them as well the serial numbers on the hosel. Tour irons will have either no serial number or Txxxx number.

A golfer on tour can use any clubs he wants, though most will use tour equipment given to them by the companies. There are many stories of golfers breaking a club and going to a retail store to buy a replacement for a tournament.

That is an amazing question I've never thought of having heard it so many times. Almost all the clubs are qualified to play in the "Tour" but when they refer to the tour club, they mean the club that the Pros are using in the tour (may be just an expression to lift up the status of certain model).
It used to be that the tour pros are using blade iron, and really steep loft woods, with very stiff shafts, but I guess tour pros anything these days, so such expression of the tour clubs may be obsolete soon.

No, it's nothing like that, there is no rule to what pros use.

The tour versions of clubs are just for better players. They'll have smaller cavities, less offset, smaller and thinner profile, more open faces, and a smaller sweet spot.

They are more workable so better players can curve the ball how they want.