Are these tracks rare for a 1977 set?

Yes, as part of the 1977 Service Packs, these 2 pieces are considered a specific and collectible item.

What is the theme associated with this set?

This item belongs to the classic LEGO Service Packs theme.

The set 1105-1 contains exactly 2 pieces.

Name: LEGO Crawler Tracks (1105-1)
Brand: LEGO

Service Packs

Service Packs · 1977

Theme · Service PacksPieces · 2Set Number · 1105-1Year · 1977

Used

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New / Sealed

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Are these tracks rare for a 1977 set?: Yes, as part of the 1977 Service Packs, these 2 pieces are considered a specific and collectible item.
What is the theme associated with this set?: This item belongs to the classic LEGO Service Packs theme.
How many pieces are in the 1105-1 set?: The set 1105-1 contains exactly 2 pieces.