Old 03-16-16, 10:42 AM
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Join Date: Dec 2009
Location: Denver area (Ken Caryl Valley)
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Bikes: 2014 BMC SLR01 DA Mech, 2020 Santa Cruz Stigmata, Yeti SB4.5, Pivot Shuttle

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When compared to the SL2, it is definitely even vertically stiffer...that is most noticeable to me. It is probably laterally stiffer but I only say that because it is a bit easier to carve fast turns on it and stand and pedal. I'm not too well-versed in lateral and vertical and related carbon layup. However, my SL2 had Easton SLX70 wheels and the SL4 has DT240s (24x28) with CX Rays and Pacenti SL23s, so the SL4's wheel set may be stiffer. The SL4 just feels stiffer all around but some may say it is too stiff for a true endurance bike, at least without a flexier seat post. I had the CG-R and then bought a FSA and both were softer than the stock post, which I preferred.
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