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I can average 21.7mph for a 20 mile time trial (00:55:15), on my 2001 Rockhopper with 1.25" fatboy slicks, no lock out on shock. My bike weighs 25.25 lbs. I'm planning on buying a Cervelo 2012 r3, 16.4 lbs estimated weight. I also plan on dropping 4-6 lbs, so my total weight would be about 14 pounds less. Does anyone have any idea what my average speed would be for a 20 mile time trial in good conditions, 10 mph max wind?

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This completely depends on the route - how hilly is it? Are there a lot of sharp turns that'll make you slow down then accelerate back up to speed? – Jefromi Nov 17 '12 at 5:38
JEFROMI The course i plan on doing in MAY 2013 is flat, 10mls down 10mls back. Wind is normaly 5-15 mph. THANKS. – jfdez599 Nov 17 '12 at 5:46
The R3 has several advantages over the Rockhopper: No shocks, aero position, narrower tires, and lower weight. Their significance is probably in that order. Gaining 3 mph or so would be reasonable to expect. – Daniel R Hicks Nov 17 '12 at 13:11
Daniel, I would be content if i can avg 24.0mph over the 20mls tt, This yes the speeds where between 17.5-27.0mph, the cyclist agv 23mph+ where all on TT bikes. 24.0 mph would have placed me 1st on regular ROAD BIKE, thats my goal. THANKS. JCF. – jfdez599 Nov 17 '12 at 19:10

You might want to play around with Bike Calculator a little, and you could find a reasonable estimate for your question.

Regarding the new bike purchase, shop around carefully. You're already past what is considered the clearance season for 2012 models at many traditional brick-and-mortar bicycle retailers. Prime time is August/September of each year. That's when many retailers start their clearance sales.

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ZIPPY, Looks like 24.0mph est, in 3 differnt handle bar positions. A CERVELO P3 would really make an impact, but i can't afford 2 bikes. A R3 would be my choice for all around road bike. THANK YOU – jfdez599 Nov 17 '12 at 7:47

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