what is a bolt pattern?

[ridesa00400EX]

i was going to order my rims from here:

http://www.mps-shop.com/motoxtreme/product.asp?pf%5Fid=805&dept%5Fid=2109&error=&makemodel=&model%5Fyear=&attr%5Fvalue1=9x9&attr%5Fvalue2=4+on+143&attr%5Fvalue3=&attr%5Fvalue4=&attr%5Fvalue5=&status=OK&mscssid=DUMMYF09N60M9G8ADCF8UN8JGAQDC8G4

but it asks for a certain bolt pattern what do i pick if i have a 400ex?

[Extremeracer167]

Fronts- 4/144
Rears- 4/110

[ridesa00400EX]

thanks i found it. do you think that s agood dea at that site?