I weigh 160 and ride single, so 40 in both works good for me. Anything less I get some cupping and a small tank slapped wobble when I let go of the bars.*

* that is another story

2005 Model . Two Fast Eddy stickers , a bell and a clock . She's Lola . She tinkles and keeps time . http://s649.photobucket.com/albums/uu211/britbike05/