I use just a touch of Bag Balm (because it's cheaper and it works) on most rides of 40-100 miles. On the 7-day AIDS/LIfeCycle, I use Chamois Butt'r because they supply it and it's easier to pack the the Bag Balm. I like either.
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Truth is stranger than reality.
'96 Giant ATX 760 MTB
'01 Bianchi Eros
'05 Giant OCR Llimited Carbon Fiber + upgrades