Pre-cut to length Strong 420 chain Short 42 link High-quality Here is the shorter chain for the Tomberlin Firehawk 6.0 mini bike Note: The Tomberlin Firehawk commonly uses two chains, a long 90 link and this shorter 42 link Here is the shorter chain for the Tomberlin Firehawk 6.0 mini bike. Note: The Tomberlin Firehawk commonly uses two chains, a long 90 link and this shorter 42 link. This size 420 chain with 42 total links (21 outer links + 21 inner links).