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My guess: Dirt between the rim and the spoke nipple. My story: My road bike began to crack last winter when I rode slower than usual because of the ice sheet on the streets. I could locate to cracking to come from the rear of the bike and determined it to originate from the rear wheel, because it appeared with almost constant frequency while coasting, too. ...

When I had this problem, I pulled the cranks and bottom bracket off, cleaned them, then greased them liberally while putting it all back together. This fixed my problem.

I'm not gonna ding you with a "duplicate question", but see, eg, Creaking from cranks/spindle. How to fix? . And there are several others. Creaking is a fairly common problem and can be due to a number of causes: The crank arms shifting on the crank axle. (This is by far the most serious of the conditions, since, left untreated, it can result in ...

I had a similar issue and spend 2 months trying to pinpoint the issue. The main places I would suggest checking are your cleats (assuming you are using them since you mentioned it was a race bike), Bolts on all connection points (handlebars, seat, etc) and then finally if none of those are out of place check the rear hub to see if it needs rebuilding.