ZNAP Tri-Bike – 3531 lego guide 7 years ago BUILDING INSTRUCTIONS FOR 3531, ZNAP Tri-Bike, ZNAP Set Number: 3531 Theme: ZNAP Launch Year: 1998 ZNAP Tri-Bike – 3531 File Size – 3.13 Mb Description – BUILD.INST. FOR 3531Download ZNAP Tri-Bike – 3531 building instruction Print Versions Building instructions labeled “NA” or “V39” may be printed on US standard letter size paper Building instructions labeled “IN” or “V29” may be printed on EU standard A4 paper