Old 03-16-16, 08:56 AM
  #6  
Chandne
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Join Date: Dec 2009
Location: Denver area (Ken Caryl Valley)
Posts: 1,394

Bikes: 2014 BMC SLR01 DA Mech, 2020 Santa Cruz Stigmata, Yeti SB4.5, Pivot Shuttle

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I had a Roubaix S-Works SL2 and then jumped to a SL4 (Expert). The difference between the two is primarily that the SL4 is a lot stiffer. The SL2 had a lot of vertical compliance which was nice but was not as responsive as the SL4. They steer the same and the SL2 is more comfortable with its compliance but did feel a bit mushy at times. It didn't actually notice that till I rode the stiffer SL4. For long rides though, it was amazing. The SL4 is more responsive and stiffer/harsher over time but still very stable and with a nice seat post (CG-R or FSA or Syntace) it is pretty balanced. Without a nice seat post, it can feel a bit too stiff in the back while the front is still very compliant.

Like someone asked, what do you want to achieve with this. A stiffer and lighter bike may shave a couple of minutes off a 60-minute ride but it that what you want? The SL2 is the most comfortable bike I have ridden. I don't know much about the SL3.
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