Introductions - I didn't think I'd like it this much.

Hi, I'm new to cycling. Had an epiphany and started cycling to get healthier. I thought it would be best for my knees. I honestly didn't think I would like it so much.

I was given an older Cannondale Super V1000 (FS) in great shape and I love it. But its a medium (8.25") and I'm pretty cramped. I've done everything I know of to make it fit, raised the handlebars, move the saddle back as far as possible. It feels like I'm peddling back a little when I ride. Actually pulls me forward on the saddle. I'm 6'.

I like the Mt Bike aspects eventhough I ride mostly on streets (rough streets) and hard packed dirt trails/beach paths. I put some street/path combo tires on it. It seems to suit my back really well except the cramped feel.

I recently came across a Specialized S-Works M5 Hard Tail (V brakes) for a good price. Problem is, it's a 21". (XL). From what I can tell by the specs, the wheel base about 23mm longer than a Large which is about 12mm longer than a medium. (Whew so much to learn) Of course I'll ride it first but I'm hoping it won't be too long of a wheel base.

If anyone has some advice for a noobie about the Cannondale or Specialized S-Works M5, I'd sure welcome it.

Welcome to BF. I'm definitely not an expert on sizing but at 6' I would think a medium is too small and that XL may be too big. Quite the dilemma.

Cycling is a great activity. You will love it, but if you plan to stay with it and not get too discouraged, you will have to get a bike that fits you, and with components that won't break down on you with almost every ride. Used mountain bikes are notorious for being beat up. I don't know about the one that you're looking at, but generally one is well advised to stay away from used mtn bikes. I know it may seem counterproductive when you first start out, and it can get expensive, but I can almost guarantee that you won't continue by riding an old mountain bike that doesn't fit. Your local bike shop can be of great value to you. They usually know how to fit, and you may be able to find a good starter bike new that's affordable. Good luck to you. I hope things work out.

Welcome to the forum!

However tempting it may be, a bike that does not fit you is NOT a good deal. Try it out, but if it feels too big, don't buy. A better deal will come along.