Not going to happen! Can barely talk the boss into letting me get one!

I am looking to buy my first real road bike in 2015. I currently ride a Specialized Secture sport disc with Sora components, but want to up grade this year.

I am confused on a few things?

These are the two bikes I have my eye on
Specialized Bicycle Components ... -comp-disc

And this one
Specialized Bicycle Components ... omp-carbon

If a person rode 50 miles on pavement on a 2015 Roubaix SL4 Comp Disc with road tires and then took those exact same road tires and put them on a Diverge Comp Carbon and then rode 50 miles. What would be the difference? What would a person come away from those rides saying?

If a person Rode 50 miles on a gravel road on a 2015 Roubaix SL4 Comp Disc with Gravel grinder tires and then took those exact same gravel grinder tires and put them on a Diverge Comp Carbon and then Rode 50 miles. What would be the difference? What would a person come away from those rides saying?

The longer this thread goes, the farther you get from useful responses. Proceed at your own risk.

The stack and reach are the same so fit should be the same. The Diverage fits 35mm tires should the Roubaix Disc clears 32mm tires. I'm not seeing where the big difference is but I haven't ridden the Diverge.

If you want only ONE bike, the Diverge is the one to get. No longer a need for separate bikes for all the riding you typically do.

Hadn't heard of this bike before reading this thread, so I looked it up. Now I want one.

But it won't be in the local bike shop until December, according to their computer :(

There isn't going to be a great difference. You can put a wider tire on the Diverge. For rough riding this smooths out the ride and will provide more control. The Diverge is going to be slower on pavement because its heavier.
Pick the bike as I stated earlier based upon what roads you anticipate riding. If they are mostly gravel and dirt, get the Diverge. If only rare forays onto the dirt or gravel, get the Roubaix, it will be better for pavement riding. Not really that complicated unless you make it.

The essence of the 41 distilled.

Its tough to answer your question without riding them both. They should be similar but not exactly the same. They have different tube shapes, and use different materials (The roubaix uses 8r carbon, and the Diverge 10r).

Test ride them both and see what you think. They are both very nice bikes.

A Very important point the Spec dealer tried to sell me on (before I went Bianchi from another LBS) was that the Zerts on the seat stays angle UP on the Roubaix, but DOWN on the Diverge. He was convinced that had a spectacular difference in handling and performance, but I didn't track.

Here's another reason to get the Diverge:

If you are a tall guy (not necessarily big) and need a 64cm frame, Diverge is the only option (and you can forget the Expert Carbon at that -- Comp Carbon only). Roubaix is no longer offered in 64 (since 2014 model?), nor is Trek Domane (Trek Madone is), nor is Giant Defy, nor is GT Grade. And forget about any of the smaller brands (even if you were willing to accept less than a lifetime warranty -- which I'm not).

I just had my LBS place an order for one a week ago; won't show up until mid-November.

p.s. I'm 6'7'', 215lbs.

The Diverge isn't even out yet, so no one has ridden it. So no one can tell you much past the specs:
- The Diverge can take bigger tires
- The Diverge doesn't come in full carbon until the $3500 price point, whereas the Roubaix comes in full carbon around $2,000 (though lower quality carbon, 8r around $2,000 vs 10r around $3500 for both the diverge and rouabix).
- I believe the Diverge comes with rack and fender mounts while the roubaix does not. You can get racks that fit on the roubaix despite that though, but it's nicer to have mounts.

Otherwise yeah, they "should" ride basically the same with the same exact tires on them.

No one knows for sure though as they're not out. The Trek Emonda for example, had a lame "lightest bike ever" marketing slogan. But then it came out and it had a ride that was a real improvement from previous models - you couldn't tell that from the specs.

I rode it yesterday for a few miles. The a1 expert only as they didn't get a carbon model in. I'm in Monterey where they did the dealer event so my dealer has special hookups so on Monday they are getting in touch with the fa Tory to see how quick we can get one in for me. If I throw down the cash they will be quicker obviously.

The ride was OK. Tiagra is garbage, but I'm comparing it to di2 ultegra. Funny story with me is I bought a 2013 defy from the dealer for 3800 with full di2, but they don't take my amex so I've got to wait for a new debit card, then the spec dealer called to test the diverge lol. So now I'm thinking of backing out if the sale for the defy.

Forgive me for being simple but.....to get into a carbon frame in the diverge you have to spend 3500; in the roubaix you get into carbon with disc brakes at 1950. How much does price matter?

I got a 2015 roubaix sport and love it. That said I stay on road. It is great at reducing road noise (ie chipseal) but not necessarily big bumps and large gravel. I also have to say the new 11 speed 5800 105 group set is wonderful.

Right now only the two lower-end aluminum versions are available. The carbon versions will be available in November, IIRC.

The standard tire on the aluminum Diverge is a 700x30. There's a bunch more room, though I haven't measured it. I think the tire on the carbon models will be a 30/32.

The geometry and dimensions of the Diverge and Roubaix are different. For example, in my size (58), the head tube on the Roubaix is 225mm, while on the Diverge it's 197mm, or shorter than on lower-end Tarmacs (205mm). Also, the carbon version and aluminum version have slightly different dimensions, though not enough difference to worry about.

Just FYI...

No.

Has somebody tested the Diverge carbon comp now?

I have one on order. Bike shop is saying right around Thanksgiving for delivery.

Here's a review. It's from Australia, so the the model may be slightly different from what's available in Norway or the US.

You need to take into account the longer fork blades on the Diverge. Stack and reach are actually the same between it and the Roubaix. Wheelbase, front-center, seat tube and head tube angles, and fork rake are also the same, so they really do have as identical geometry as you can get. The only difference is that the Diverge will have more trail and a higher center of gravity when used with wider tyres.

Hhhmmm i have the sirrus comp carbon 14 mod who has the same frame as the Roubaix 15mod. The new sirrus has change frame, dont think the Roubaix frame is new derfor its the same as the sirrus 14mod. Sow if i put dropbars (then I have the Roubaix)and put some of the tires from the diverge (700*30) ill will pritty close to Diverge? And the Roubaix only needs to change tires to get closer? Just thinking of the options i have with this great bike :)

Fiery got it right.
For those interested, to me this isn't a hard decision. The Roubaix is the best bike for pavement riding and the Diverge is the best bike for riding gravel because of tire clearance and being able to put a wider tire on the Diverge. If ride the gravel a lot, get the Diverge. If you ride the gravel only on occasion, get the Roubaix which is a very versatile road bike. Not complicated.

Actually, the best bike (from Specialized) for gravel is the Crux. Prices are less than comparable Diverge models, 38mm (maybe even 40mm) tires are no problem, geometry isn't bad, and they are readily available.

How narrow a tire can you put on the diverge without adverse effect? If you can basically run it down to a skinny option akin to the roubaix equivalent, I'm swooning and thoroughly in a love at first sight moment.

Could you conceivably even squeeze some studded tires on that thing for icy winter riding? Trying to do the math on how narrow a set of studs you can get your hands on.

Yes that is correct. The Roubaix does take 32mm tires. But it aint much clerence left. Its absolut maximum. There is a pic of it in a hybrid thread somewhere..

Explain to me why the best bike from Specialized for gravel riding is the Crux versus the Diverge. The Diverge is being marketed as Spesh's gravel bike.
Last time I looked the Crux is a cross bike with a lower stack height than the Diverge.