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Registered User
Ok so I finally got a chance to GPS my 250r yesterday. I know im being slowed down by my 18" rears but I GPS'd 67mph. Does that sound about right with the mods in my sig? Im still on stock gearing, 13/39. I have a 14tooth for the front that I havent tried yet but im thinking about trying it out. The bike pulls hard up to about 55mph then it falls on its face the rest of the way up to 67mph
CURRENT RIDE:
1986 trx250r, lsr swingarm, works shocks front and rear, and just a tad bit of motor work
2007 ltr450: gone but never will be forgotten
Registered User
that sounds about right, maybe even too fast. 18" tires kill your speed and a 39 tooth rear is 1 tooth more than the stock was. If I remember correctly, 20" tires, 13/38 gearing, it toped out at 72.
85/86 atc 250r, very modded, lrd 310pv, +1 lsr, shortrack kit, cr250r igntion, 39 pwk, paul turner hi-rev pipe, propeg nerf bars, HREATV custom frame,
86 atc200x- 84 250r exteneded axle, supertrapp pipe, 27mm carb, works rear shock, 84 250r front end(rebuilt w/ terry kit), 350x tripples, ported head, 12:1 piston, webcam,
crf450r quad, lsr frame, swinger, antifade, hyper beadlocks and the best of everything else.
88 trx 250r pced and reinforced frame, +3+0 t-pin, 310pv, cr ignition, 39 pwk, lsr rear end, elka shocks, aftermarket radiator, lrd pipe
06 ktm450exc, full skid plate/guards, radiator fan, clarke tank, dual sport kit, reg/ins/insp, steering stabilzer
98 200exc: street plated, skid/guards, dual sport lights, stabilizer and more.
07 ktm 250xc, skids, reg/ins, dampener, good lights
2011 atc450r in the works, suspension and details need to be worked out
Coating specialist
stock gearing on 86/87 is 13-39
87 250R
stock frame and brakes
everything else aftermarket
Registered User
thanks a lot for the info. Im going to put my brothers 20" flattrack tires on it and see what it does with those on GPS. Im hoping to break into the 70's with it.
Would the 14T sprocket help me out any? If so im willing to try that to keep the 18" tires on it. Even though I love how the bike pulls right now
CURRENT RIDE:
1986 trx250r, lsr swingarm, works shocks front and rear, and just a tad bit of motor work
2007 ltr450: gone but never will be forgotten
Git "R" Done
it'll rip with a 14/38-39 gearing and 18" tires.
250R's...... "they gots bite wiff dat bark !!!" R's are fo sand bars.....
'86 TRX250R (265)
'86 TRX250R (250)
'86 TRX250R (CT310) WIP
'86 TRX250R (250)
'89 TRX250R (WIP)
'88 Blastee (WIP)
Registered User
Thanks!!!Originally posted by 86 Quad R
it'll rip with a 14/38-39 gearing and 18" tires.
CURRENT RIDE:
1986 trx250r, lsr swingarm, works shocks front and rear, and just a tad bit of motor work
2007 ltr450: gone but never will be forgotten
Moderator
A 2-inch difference in tire size is a pretty big change, more than most people realize. 13/39 gearing on 20 inch tires is about the same drive ratio as 14/38 gearing with 18 inch tires.
So bumping that front sprocket up to 14, you'll end up just a little shorter than the stock drive ratio, it should perform pretty well for you.
Duncan Racing 340PV, +2 A-arms, +4 LSR axle, and a host of other goodies.
Git "R" Done
yes but the lesser rotational mass at the wheels, with great hooking tires will torque much better than a 13/39 with heavier 20" tire.
250R's...... "they gots bite wiff dat bark !!!" R's are fo sand bars.....
'86 TRX250R (265)
'86 TRX250R (250)
'86 TRX250R (CT310) WIP
'86 TRX250R (250)
'89 TRX250R (WIP)
'88 Blastee (WIP)
NEWBIE
i just changed my gearing from 12/38 to 12/36, WOW! big change, now mabee i can pass my buddys klf400, we were tied before. but, i would always get him on the turns, haha!
88 250r: stock motor, proline nerfs, proline grab bar, factory x skid plate, duralast +2 axle, maxxis pros, turf tamers, pro taper bars, red laker plastics with 88 factors decals, and ourygrips NOT FOR SALE!
Member
I haven't ridden a stock 250r that fell on it's face anywhere.
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