Tubes

[jakeyz250]

I have an opportunity to buy a set up tubes, and since i don't know much about tubes, i decided to ask around here. The tubes are 275-300 -21 and 3.00-4.00 -19 .? I don't know what all the numbers mean.. ARe these normal size tubes or are they some off size. my bike is a 1990 yz250...
Thanks

 

[jakeyz250]

i currenlty have maxxis 80/100-21 51M up front, and Maxxis 110/90-19 62M out back.

 

[YZ165]

The 80/100 and 110/90 are the aspect ratio numbers of the respective tire. Back in the day they used to just measure the width in inches. So, a 2.75-3.00/21 will work for the front. A 3.00-4.00/19 might be a touch small for the rear but will work. Sounds like a set of tubes for a 125. If they are cheap enough, go for it. Like $10.00. You can get really cheap tubes for like $5-$8 bucks each brand new in the box from any indapendant shop.

 

[jakeyz250]

there for $1.00 ,, So I think i will get them. I also bought a new seat from him, so it will increase the value of my bike, so i can sell it for top $..... haha.. Jk