Planet Minis

alex_s817

Hey guys i am new to this site but have had my bike for a few years. its an 04 sdg speed mini. i have since changed out the motor with some random chinese 125cc engine which runs well(much better than the bent valved sdg 107cc). here in north carolina the dmv states that if the "scooter" is under 50cc and has all necessary lights/dot approved tires, it can be ridden on the street without any registration or insurance. im not worried about hiding the displacement at this time since it will not be inspected.

so my questions are these:
-i currently have a 12inch front wheel and the rear is a 10. i noticed just about everyone runs the same size wheels with street tires. should i go back to a 10 inch front or buy a 12 inch rear? would a 12 inch rear even fit?
-what tires do you guys recommend for either wheel set-up? i need something that will grip well but last. bike will be ridden in light rain and maybe some light dirt/gravel terrain.
-the bike is fairly torquey as is but has no top end what so ever. what is the common/recommended front & rear sprocket size used to get a higher mph?
-and lastly, i was planning on purchasing the baja designs kit but because i dont need inspection i think i can save money and not get the battery and stator. the pitster light kit seems like it would suffice.

sorry so many questions but the help is greatly appreciated. thank you
-Alex
-

alex_s817

anyone?

MAZZ77X

From what I have read 12" wheels and tires will handle better. As for 12" tires for the street I have no clue. Dunlop TT92 are the track tire of choice though.
Your engine has no top end cause the cam is very mild in the cheap china engines (except the YX).
Everything else I have no clue on. Hope this helped a little.

alex_s817

yea thanks man any help is appreciated.

alex_s817

come on guys i know some of you know this stuff right off the top of your head
thanks

playfour20

Don't worry man im in the same predic. I have a stock "07 crf50. And I mean STOCK!!! I don't have a clue where to start. I want to go race the mini gp's but still change tires under an hour to just screw around and terrorize the neighbors! So when you get some info hit me up!

JIMMY

If your swinger is a +5 you won’t have any problems with a 12 rear. 12 rear would also mean more top end power. Do the 12 rear.

alex_s817

does it look funny on a 50cc based bike? like do they look too big? thanks guys

ZTECH

Stay with the 10/10 this will work best with your motor. Tires are cheep look for some IRC MB38 cost is under $15 each. Gearing look for a 16F and a 33rear.

alex_s817

damn i already bought a 17 tooth front sprocket but i do currently have a 16t on the bike right now. im not sure of the rear size but i can tell you that first gear is extremely short. will 12inch wheels significantly hurt me? i only ask this because i already ordered a 12 inch rear wheel assembly but i may be able to cancel it if necessary. i have both a 10 and 12 inch front wheel so that is no issue.
thanks

50-50

The larger wheel will be better for street handling. Plus, a larger diameter rear tire is like gearing the bike taller - you'll gain more top speed.