Weight training exercises, barbell curls pointless for a trackie?

Rather than doing barbell curls I would implement D.B. hammer curls which stress the Biceps Brachii , Brachialis and Brachiordialis these have the most potential for strength and make up the majority of the size of the biceps and also the gripping muscles of the forearm . After all it can't hurt to have strong forearms it gives you a direct connection to the bike .

A matter of opinion, but I would argue that straight bar curls work the biceps and forearms more thoroughly.

Doing curls at all will have no effect at all to anything on the bike other than impressing the ladies. And even then you have to work jolly hard at them for it to achieve anything.

Deadlifts, Rows, Pull ups etc... will give you the pulling strength across the body and in your arms and back to achieve anything worthwhile. Like making you rock solid and able to grip and brace yourself against the bike. The deadlifts will develop enormous amounts of strength done right, better than everything else combined pretty much. Which will allow you to create and apply the maximum amount of force possible. Which is the aim of the game, right?