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Old 04-29-21, 10:44 AM
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Join Date: Feb 2017
Location: San Francisco Bay Area
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Bikes: Trek Madone 5.2 Dura Ace, Niner RLT9 aluminum, Santa Cruz 5010 CC

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The Wolftooth chainring made for Shimano Hollotech works great and will save you money, but the advice to go with the GRX-812 rear derailleur and M-8000 11-42 cassette is spot-on. Don't forget to include a new chain in the budget.
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