The GT Bump appears to be a BMX, and since BMXes are pretty much always ridden out of the saddle rider size doesn't matter much. They all have 20" wheels, so not much difference there either.
28lbs
Yes it is a good bike I realy recommend you getting it
37lbs
When the Interceptor first came out, they were GT's bottom of the line BMX bike. It's a better bike now, but still a low end bike.
i heard about 27 pounds.
One may purchase a GT mountain bike directly with GT bicycles's website online. Locally one may want to consult the yellow pages for bike retailers who carry the brand.
GT or Diamond back, GT's are cheaper though
Gary Turner invented the GT brand.
1984
Haro by a long shot
dyno is gt technicly but dyno was only made for afew years and they didnt perfect it i have one i love it but name brand gts' are better
GT Bicycles, a subsidiary of Dorel Industries.