It is a 1991 Pinnacle, Flare -color!
Really small one, size is 18" / XS.
Smallest size what Klein ever did.

frame: Klein Pinnacle 18" 1991
fork: Spinner
brake calipers: Grafton Speedcontrollers
casette: Shimano XTR M950
chain: Shimano
crankset: Cook Bros Racing RSR
bottom bracket: Klein
front delailleur: Shimano XTR M900
rear delailleur: Shimano XTR M900
levers: Shimano XTR M900
headset: Chris King
cables: Shimano
handlebar: Klein MC1
stem: Klein MC1
handlebar grips: Ati Tomac
seatpost: Syncros
saddle: Selle Italia Flite
pedals: Shimano SPD-M737
tyres: Onza
qr: Salsa
wheels: Chris King Classic-hubs, Araya RM-395-rims
bottle cage: Klein