[xc71]

These will take some serious weight off of juniors wheels, and the best place to save weight, which is the outside of the wheelset.
20" = 39 grams.
24" = 49 grams.
You may want to check your lottery ticket numbers before looking at the price though.
Eclipse Ultra Lite Tube : Fairwheel Bikes, Cycling Boutique

 

[jspansel]

These will take some serious weight off of juniors wheels, and the best place to save weight, which is the outside of the wheelset.
20" = 39 grams.
24" = 49 grams.
You may want to check your lottery ticket numbers before looking at the price though.
Eclipse Ultra Lite Tube : Fairwheel Bikes, Cycling Boutique

Whoa....

 

[cyclo-phile]

At $68 each, they'll seriously lighten the wallet too!

 

[indianadave]

Dans Comp tubes $4.99 ea. for 24"... Need to weigh them just for the record.

 

[TigWorld]

Eclipse tubes look great, but wow what a price! I use Schwalbe 28/20-406 (20" BMX tubes) in my daughter's 24" wheels. They weigh 85g and have been very reliable even though they are a 20" tube in a 24" 2.1 size tyre. Only $5 each, but the Eclipse are almost half the weight.

 

[kntr]

I call Gus at Arrow and get the 24" ultralite race tubes. Cheap and light.