Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Recreational Cyclocross and Gravelbiking This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like :The Dirty Kanza". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-25-14, 11:52 PM   #1
shazzberri
Junior Member
Thread Starter
 
shazzberri's Avatar
 
Join Date: Feb 2014
Location: NW United States
Bikes: 1996 Trek 6500, Hybridized
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
efficiency of dirt or gravel versus pavement

i am riding from portland to jackson, wy. about 10% to 15% will be on dirt and gravel, not pavement. is there a way to estimate speed on country dirt road from speed on pavement ? for example, is dirt road riding 30% more work ? i have one section that is about 80 miles of dirt road.
shazzberri is offline   Reply With Quote
Old 02-26-14, 12:05 AM   #2
fiatjeepdriver
Senior Member
 
Join Date: Apr 2009
Location: Jacksonville, OR
Bikes: Land Shark, Ritchey, Fat Chance, and about 19 others
Posts: 343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
IMO it really depends on the road. There are some dirt roads I can average 22-25 mph and others that I can only do 10-12 mph (assuming flat and no headwind). If the roads are well maintained and dry they will be very similar to pavement but if they are rough, loose, and/or muddy your speed will drop considerably.
fiatjeepdriver is offline   Reply With Quote
Old 02-26-14, 07:56 AM   #3
BluesDawg
just keep riding
 
BluesDawg's Avatar
 
Join Date: Feb 2005
Location: Milledgeville, Georgia
Bikes: 2015 Specialized AWOL Comp frameset (custom build), 2015 Zukas custom road, 2014 Specialized Crave Pro 29, 2003 KHS Milano Tandem, 1986 Nishiki Cadence rigid MTB, 1980ish Fuji S-12S
Posts: 13,242
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
If I had to guess, I would say about 20% slower based on the differences I see on gravel vs paved rides through the same general areas. But there can be great variation as fiatjeepdiver said.
BluesDawg is offline   Reply With Quote
Old 02-26-14, 08:30 AM   #4
NZier
Senior Member
 
Join Date: Jul 2012
Location: Lee's Summit, MO
Bikes: 2011 Cannondale Carbon Synapse (Ultegra 6800 11-spd), 2009 Blue CXC
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I would agree with other posters. The dirt is really variable depending on the recent weather, grading, and conditions. Gravel I think somewhere between 15-25% loss could be expected (again depends on weather and trail conditions). This is based off my 30 mile road rides compared to my trail rides on the same (road) bike. The trails I ride are mostly crushed limestone, but the traction isn't there to produce the same kind of energy transfer. How far of a ride are you taking, how much of a load are you carrying?

Your post makes it sound like you are doing a multi day ride; the dirt road makes me feel like it might be self supported. If this is all true, you might consider breaking up that 80 miles into parts of two days. Just my two cents.
NZier is offline   Reply With Quote
Old 02-26-14, 09:23 AM   #5
shazzberri
Junior Member
Thread Starter
 
shazzberri's Avatar
 
Join Date: Feb 2014
Location: NW United States
Bikes: 1996 Trek 6500, Hybridized
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks everyone for the good info. my ride will be about 800 miles total, 12-14 days. i am not a fast rider, ave ~ 14 mph over paved rolling hills, riding a mtn bike with wide road tires. the main stretch of dirt road is from warm springs oregon to mitchel. it is usually desert-dry dirt, hard packed in some areas, powdery in others. there is a section that is mostly packed gravel. i think breaking the stretch from warm springs to mitchel into two days is a good idea.
shazzberri is offline   Reply With Quote
Old 02-26-14, 12:04 PM   #6
Barrettscv 
Have bike, will travel
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Edwardsville, Illinois
Bikes: Colnago Nuova Mexico, Eddy Merckx Corsa Extra, Pinarello Gavia, Schwinn Paramount, Motobecane Grand Record, Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Origin8 monstercross, Pedal Force CG2 and CX2
Posts: 10,473
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
If conditions are certain to be dry and you will be on pacement for 80% of the route, use a slick or semi-slick touring tire like this: http://www.schwalbetires.com/bike_ti...athon_Almotion . Avoid knobby MTB tires. This will maximize your speed.
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 03:51 AM.