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Summary:
Entire kit saves 40lbs
Entire kit costs $10k
Kit allows 18" wheels
Kit's caliper allows quick pad changes
(There's also two areas of thought with regards to caliper weight & design. Some would argue rigidity (eg a fixed bridge) is of greater benefit than the convenience of quicker pad changes. But will leave for another thread)
Going from OEM disc to aluminium hat type disc saves 90% of the 40lb total
Conclusion:
If you don't need to run 18" wheels, and spending 5 more minutes swapping pads every ~6 months is not an issue either; and you're after the weight savings primarily, then buy/find just aluminium hat type discs that work with the OEM caliper.
Literally a 90% of the benefit for 10% of the cost scenario.
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