LEGO 5291 Lift-Arms, Triangles is a vintage Service Packs set from 1996 valued at $4 for new and sealed sets, up 24% from an original retail price of $2.99. Annual appreciation has averaged 3.40% since release. On the used market, values range from $3 to $3 based on condition. Secondary market prices for new and sealed sets typically fall between $3 and $4.
LEGO 5291-1 Lift-Arms, Triangles is a Service Packs Technic set released in 1996, containing 12 pieces. The assortment comprises light gray elements including a Technic Axle and Pin Connector Perpendicular, a thin Technic Beam 1 x 3, a thin Technic Beam 1 x 4 with stud connector, and a thin Technic Triangle 3 x 5 (Type I) with full supports. It is similar in content to set 5280 Lift-Arms and Triangles.
A new and sealed Lift-Arms, Triangles is currently valued at around $4, with annual growth of approximately 2%, which is lower than other Technic sets. The average used price is $3 for those in good overall condition. While long-term growth remains positive, recent trends indicate the rate of appreciation is slowing. Based on current trends, this set could be valued near $4 within the next year.