Conversation so far:
Who did Tom move to Paris with?
CANNOTANSWER.
What did Tom do in Paris?
In Paris-Roubaix Simpson worked for teammate, and winner, Emile Daems, finishing ninth.
How long did Tom stay in Paris?
On 26 May, Simpson rode in the one-day, 557 km (346 mi) Bordeaux-Paris.
Also known as the "Derby of the Road", it was the longest he had ever ridden.
Did Tom win that race on May 26 named Derby of the road?
His lead steadily increased, and he finished in the Parc des Princes over five minutes ahead of teammate Piet Rentmeester.

Question: What was the next race he competed in, in Paris?
Self-contained rewrite: What was the next race Tom Simpson competed in, in Paris, after Derby of the road?