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-   -   2017 Roubaix geometry changed?! How to choose the right size? (https://www.bikeforums.net/general-cycling-discussion/1084850-2017-roubaix-geometry-changed-how-choose-right-size.html)

Aero-X 10-19-16 06:27 PM

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

jacksdad 10-19-16 08:00 PM

Sorry I don't have a suggestion beyond taking your bike to a shop and trying to replicate your fit with a tape measure.

I'm curious though about you having the seat all the way back. I thought a common complaint was the seatpost setback causing people (as it does for me) to push the seat all the way forward.

Aero-X 10-19-16 08:03 PM


Originally Posted by jacksdad (Post 19135112)
Sorry I don't have a suggestion beyond taking your bike to a shop and trying to replicate your fit with a tape measure.

I'm curious though about you having the seat all the way back. I thought a common complaint was the seatpost setback causing people (as it does for me) to push the seat all the way forward.

My current seat post has 20mm setback. I push my saddle further back so I can roll my pelvis forward and engage my glutes and hamstring to initiate the pedal stroke.

alcjphil 10-19-16 08:29 PM

Why not take your bike to a couple of Specialized dealers and ask them about the new geometry and how it affects fit? You are throwing out so many numbers that you may not be seeing the tree within the forest. If you want to buy a new bike you will have to go to a dealer anyway. Why not ask these questions there?

pacificaslim 10-19-16 10:30 PM

If the new one has 40mm smaller head tube, but still has 8mm higher stack, then something is different. Doesn't the new model have some sort of suspension fitting at the head tube? Maybe once that is added in, the total head tube area before spacers is roughly the same as last year?

scrming 10-20-16 04:38 AM

I have a completely stock 2016 Roubiax SL4 Comp. I also just picked up a 2017 Roubaix Expert.... Both are 56cm. I haven't done a side by side comparison or compared measurements... I will see about doing that later, but my gut reaction is the new 2017 Roubiax may actually have me slightly more up right... I also had a 56cm 2015 Diverge... The new 56cm Roubaix fits me just as good, if not better than the old Roubaix or Diverge..

tedder987 10-20-16 02:51 PM

I am looking to buy one also (comp, with mechanical ultegra) and when I was doing a bike fit in the store we measured up a 58 that they had in stock (higher model). From memory,

- you can still have up to 3-5mm spacers
- the futureshock adds 30mm above the top of the head tube

So that adds up to 45mm above the head tube (if you use all 3 spacers) which is more than the inch you want. You could also go with a more angled stem. The default is a +/- 6 degrees. I will probably be putting a +17 degree on to get the front end higher myself.

tedder987 10-22-16 07:35 AM

btw, road a 58cm at Moment's new store in Carmel CValley yesterday and put down a deposit on a comp version (cheaper than what was in stock). Side by side with my XL Giant Defy (Al version) which has a high-rise stem on it the handlebars were only ~1" lower with the Spz stem in the -6 degree rotation but with 3 spacers in place so its definitely tall at the front if you want it to be.

Best bet now would be to find a shop that has the size you think you need and go in with your current ride to see them side by side

Mr IGH 10-22-16 07:53 AM

Just fixate on stack and reach. Reach is within 2mm, basically the same. Stack is 8mm higher on the new model, requires 8mm less stem spacer for same fit.

Mr IGH 10-22-16 01:46 PM

Looks as if the head tube length isn't the full story for stack, there's a shock in the head tube/fork adding to the stack:

We call it Future Shock, and essentially, it's a piston in the head tube with 20mm of travel. We developed this technology in partnership with McLaren Applied Technologies, and the result of this are a host of drastic performance improvements, namely in the vertical compliance department.

Nomad2 05-18-17 02:19 AM

Hi
I know this is an old thread, but just wondering if anyone has worked out if the stack measurement includes or excludes the future shock? In some ways it doesn't make sense to include it as the spacers are underneath the future shock. The top of the head tube doesn't look as high as other endurance road bikes.


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