Had a look at the B737-200ADV Boeing Flight Planning and Performance Manual (April 06, 2001) under the sub heading Takeoff Speeds, and it states:
"The speeds presented in the Takeoff Speeds table can be used for all performance conditions except where adjustments must be made to V1 for clearway, stopway, anti-skid inoperative, improved climb, contaminated runway situations, brake energy limits or tire speed limits. These speeds may be used for weights less than or equal to the performance limited weight".
On another subject: I recall once seeing a Boeing statement which I think came from a Boeing 737 Operators Symposium way back in the Eighties that said that a 10 knot decrease in VR equated to 7% less wear and tear on tyres due reduced tyre speed. Has anyone seen similar figures quoted elsewhere?