| Title: | Bicycling | 
| Notice: | Bicycling for Fun | 
| Moderator: | JAMIN::WASSER | 
| Created: | Mon Apr 14 1986 | 
| Last Modified: | Fri Jun 06 1997 | 
| Last Successful Update: | Fri Jun 06 1997 | 
| Number of topics: | 3214 | 
| Total number of notes: | 31946 | 
     I have just entered the exciting world of Mountain Biking
    after many years of road riding.  My first hint that I
    have a lot to learn was noticing the pressure rating on
    the sidewall was 40-80 psi(quite a range!). 
    
    I know on a road bike using maximum rated pressure rolls
    easier,protects rims, avoids snakebites   :    , and lessens
    flats. 
    
    I am under the impression that I will have to use different
    psi for different conditions to compromise traction versus
    rolling resistance. (My second hint of "a lot to learn"
    was trying to ride up a near vertical wet grass and gravel
    trail.- This stuff is FUN! :-)) 
    
    I would like to keep damage to a minimum while I figure the
    optimum psi compromises.  Any hints to get me started? What is
    your preferred pressures for various conditions? e.g.
    potholed gravel roads, smooth trail, *very* rocky/rough
    trail, combination paved and gravel and trail rides, etc. 
    
    Thom    
| T.R | Title | User | Personal Name | Date | Lines | 
|---|---|---|---|---|---|
| 265.1 | Dirt Bikin'; the low pressure sport.... | MENTOR::REG | Who is Sylvester McCoy | Tue Apr 14 1987 11:43 | 15 | 
|     
    	My recommendations:-
    
    	15 - 20	Slime covered rocks, the *WORST STUFF*
    
    	20 - 30	General Trail conditions, mostly dry, gentle grades,
		firm ground.
    
    	30 - 40	On and off road
    
    	I wouldn't go over 40 psi on mine (2.125s), and I wouldn't go
    below 15 either.
    
	Reg
    
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| 265.2 | more psi? | MANANA::RUDNICK | Wed Apr 22 1987 15:35 | 9 | |
|     I think I'd go a bit higher than 40psi on the road.  Especially
    if you get into using the bike to carry any weight as in commuting
    to work carrying clothes, shower supplies etc.  I forgot to up the
    pressure in my tires last year after some trail riding, headed to
    work one day, started getting a little hyper on the bike (ie. jumping
    curbs, roughing it etc) and ended up with a snake bite.  Just a
    suggestion.. collect your own grains of salt...
    
    Ben.
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| 265.3 | Less is best, but stay light... | MENTOR::REG | Who is Sylvester McCoy | Thu Apr 23 1987 10:10 | 6 | 
|     re .2	WudYaAckchulyCommuteOnTheATBAndStayOnTheRoad ?  Only time I
    commute by ATB is when I'm plannin to go through the sand pits and
    apple orchard, else its skinny tyre time.  Whatever my tyre pressure
    I try to stay light, i.e. banging curbs is gonna get snake bites,
    so jump 'em.
    
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