Old 10-19-16, 06:27 PM
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Aero-X
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Join Date: Jan 2006
Location: SF Bay Area
Posts: 108

Bikes: Cervelo RS, Langster SP, S-Works Roubaix

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2017 Roubaix geometry changed?! How to choose the right size?

Guys,

I was checking out the new 2017 Specialized Roubaix on Specialized website. I noticed there's a drastic changes in it's geometry. I currently ride a previous generation Roubaix SL4 56cm. Reach 387mm, Stack 589mm, 565mm HTT and a 190mm Head tube length. The 2017 Roubaix 56cm has Reach 385mm, Stack 597mm, 561mm HTT, and a much reduced 150mm head tube length.

My SL4 has about 1" of spacers above the headset cover which is about 1cm tall. Now with the 2017 Roubaix, it has a future shock stack which looks about 1" tall, that's only 25mm. The riser bar came with the new roubaix has 15mm rise. So all that still doesn't add up to my current cockpit height.

So if I were to upgrade to the new Roubaix, I would need to size up to get a 58cm frame size so I can still have a more upright position? The new Roubaix 58cm frame size has a 185mm head tube and a 576mm HTT. But then I have the top tube length problem. On my 56cm SL4, I run a 80mm 5 degree rise stem with saddle pushed all the way to the back. So I would need an even shorter stem if I were to go with 58cm size? I really don't want a shorter stem than 80mm.

BTW, the BB drop on both generations are very different. New Roubaix 76cm, SL4 71.5cm, both 56cm frame size. SL4 has 271mm BB height, but 2017 Roubaix geometry chart doesn't say BB height. It only has BB drop.

I had two more Roubaix before the SL4. The 2005 Roubaix Pro, the 2008 Roubaix SL, then the current SL4. The geometry didn't change across those 3 Roubaixs. I always get a 56cm frame. They fit nice. Now this 2017 new roubaix definitely a little hard to figure out size wise.

Any suggestions?

Thanks.

AX
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