Henley 1 Posted November 18, 2017 Share OK OK I know road bikes are faster on tarred roads that mountain bikes.The question is, however, by how much?Given: the "average" road bike with 7 bar tires vs the "average" 29er mtb with 3 bar tires. Let's make the rider also the average weekend warrior. assume no wind.Main effects of course are: weight, tire resistance and air resistanceWaiting to hear what the hotshots think .... how much faster? Link to comment Share on other sites More sharing options...
JB37 Posted November 18, 2017 Share Does the MTB have slicks or nobblies. Link to comment Share on other sites More sharing options...
Dieter ( ͡° ͜ʖ ͡°) Posted November 18, 2017 Share After a quick google A general rule of thumb is that if you are switching from a mountain bike with knobbies to a road bike you will be between 15-20% faster at the same watts/effort. Typically that's only a change of 3-5 kmph. Link to comment Share on other sites More sharing options...
porqui Posted November 18, 2017 Share It's Saturday !! Link to comment Share on other sites More sharing options...
shaper Posted November 18, 2017 Share After a quick google A general rule of thumb is that if you are switching from a mountain bike with knobbies to a road bike you will be between 15-20% faster at the same watts/effort. Typically that's only a change of 3-5 kmph.Over what distance? If over 1km then may well be but would think the rolling resistance and increased fatigue over 100kms would be more? Link to comment Share on other sites More sharing options...
Eugene Posted November 18, 2017 Share Let's not forget fear ratios Link to comment Share on other sites More sharing options...
Puncture Kid Posted November 18, 2017 Share Let's not forget fear ratios MTB'ers 'fear' nothing.. Link to comment Share on other sites More sharing options...
26er Posted November 18, 2017 Share About 20% on 30km/hThe faster you go from there the bigger the difference Link to comment Share on other sites More sharing options...
Eldron Posted November 18, 2017 Share I got 17% when I compared mtb with knobblies to road bike at 94.7 with similar fitness. Link to comment Share on other sites More sharing options...
Eugene Posted November 18, 2017 Share Let's not forget fear ratiosBloody predictive text. Supposed to be "gear ratios". But I suppose "fear ratios" could also be apt. Link to comment Share on other sites More sharing options...
arendoog Posted November 18, 2017 Share About 4,5km/h slower on MTB with crossmark tyres pumped to 3 Bar ,in my case Link to comment Share on other sites More sharing options...
Colin Pym Posted November 18, 2017 Share Did a couple of road rides on my MTB, generally finished with an average of approximately 26 kmh. Got myself a roadie, participated in two events so far and finished with average speeds of app 32-33kmh. So, in my case a nice noticeable difference ????. Better gears, low rolling resistance help keep with the bunch. Link to comment Share on other sites More sharing options...
Shebeen Posted November 18, 2017 Share This is either should i be doing 94.7 or double century on my MTB type of thread Link to comment Share on other sites More sharing options...
peetwindhoek Posted November 18, 2017 Share This is either should i be doing 94.7 or double century on my MTB type of threadSwitch bikes after lap 1? I can see the thread now: *which bike to start double loop with and why?* Link to comment Share on other sites More sharing options...
Grease_Monkey Posted November 19, 2017 Share There are gear ratios which make a big difference, and of course geometry - a road bike already sits in a better climbing and pedaling position that even the best XC race whips, but since we are talking average rider and bikes you would have to compare to a trail bike with an even worse climbing/pedalong position. Random guess for someone that does a 100km in 4hrs on a road bike - it would take 5 to 5 and a half hours on a trail bike. Link to comment Share on other sites More sharing options...
Henley 1 Posted November 19, 2017 Share Interesting comments indeed!I love my FELT carbon full sus 29er so much that I lately do all road race with it - on 3 bar knobblies. Of course I am not a serious cyclist: typically I would ave 30 km/hr over 90km on the rolling hills north of Durban in a triathlon, and typically ave 23 km/hr in more hilly terrain with the mtb in PE. That is, however, comparing apples with pears - hence my question above.Thanx for the input! Link to comment Share on other sites More sharing options...
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