I have a baby/toddler who likes to ride around with me.
Currently have a seat on a rear rack, all is well.

Except that I'm switching bikes, Diamondback Trace EXC
the new bike doesn't have any rear rack holes.

Considering a seat-post clamp with rack mounts (seems really easy, and I can get it today at a local store)
something like this http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1541

vs.
tubus stay mounting clamps (more involved, have to order online)

baby is 21lbs right now.
do you think it’s safe to go either way?
personally, I believe both options are good. but I don't have any experience with these.

I think that the brackets will be tighter with the tubus option - (b/c they'll be shorter)

thanks for your insight.

sincerely,
ryan

two options pictured for reference