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For all the engineers and tool guys out there, here's a method to measure chain stretch using a 6 in. vernier caliper:
1) set the caliper at 5.6 in.
2) insert the inside measuring jaws between the chain rollers
3) extend the jaws to tension the chain and record the measurement
new chain = 5.715 in.
1/2% stretch (equivalent to 1/16 in. over 12 in.) = 5.745 in.
3/4% stretch (equivalent to 3/32 in. over 12 in.) = 5.760 in.
1% stretch (equivalent to 1/8 in. over 12 in.) = 5.775 in.
1) set the caliper at 5.6 in.
2) insert the inside measuring jaws between the chain rollers
3) extend the jaws to tension the chain and record the measurement
new chain = 5.715 in.
1/2% stretch (equivalent to 1/16 in. over 12 in.) = 5.745 in.
3/4% stretch (equivalent to 3/32 in. over 12 in.) = 5.760 in.
1% stretch (equivalent to 1/8 in. over 12 in.) = 5.775 in.