[mikegug1]

please excuse my stupidity-- wanted to get into riding with my 8 yr old and took my brother old racing bike-how do i fill the matrix tires with the tricky pin setup-dont laugh-
thanks!

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[PaulH]

Never heard of matrix tires, but assume from your description that they have Presta valves. Remove the valve cap and unscrew the little brass nut on the "pin". Attach pump and fill with air. If your pumb lacks a Presta adaptor, your local bike shop should have one. Once finished, screw the brass nut in so that the valve is kept closed.

Paul