Ullrich is warming up for another shot at the Tour de France

The T-Mobile rider set a time of 58 minutes and 48 seconds, 28 seconds faster than Italy's Ivan Basso with his compatriot Marco Pinotti, 1:01 adrift.

Basso's performance was enough to extend his overall race lead to two minutes and 48 seconds over Spain's Jose Enrique Gutierrez.

Ullrich is not in contention overall, trailing Basso by over eight minutes.

The German, warming up for another bid at victory in the Tour de France in July, rode at an average speed of 51.02 kph (31.63 mph) as the 21-stage race resumed after a rest day.

While Basso, second to Lance Armstrong in last year's Tour, increased his overall lead, former Giro winners Damiano Cunego and Gilberto Simoni fell to over seven minutes behind.

Spain's Jose Gutierrez Cataluna is second overall, 2:48 back.

Friday's 171km 12th stage is from Livorno to Sestri Levante.

Giro d'Italia stage 11 result:

1. Jan Ullrich (Ger) 58:48"
2. Ivan Basso (Ita) +28"
3. Marco Pinotti (Ita) +1:01"
4. Sergei Gontchar (Ukr) +1:09"
5. Paolo Savoldelli (Ita) +1:19"
6. Jose Enrique Gutierrez (Spa) +1:42"
7. Jens Voigt (Ger) +2:12"
8. Gustav Erik Larsson (Swe) +2:22"
9. Dario Cioni (Ita) +2:24"
10. Viatcheslav Ekimov (Rus) +2:27"

Giro d'Italia overall standings:

1. Ivan Basso (Ita) Team CSC 40 hours 28 minutes 56 seconds
2. Jose Gutierrez (Spa) Phonak +2mins 48secs
3. Serguei Gontchar (Ukr) T-Mobile Team +3mins 24secs
4. Paolo Savoldelli (Ita) Discovery +3mins 26secs
5. Tom Danielson (USA) Discovery +5mins 38secs
6. Franco Pellizotti (Ita) Liquigas +6mins 37secs
7. Victor Hugo Pena (Col) Phonak +6mins 54secs
8. Damiano Cunego (Ita) Lampre-Fondital +7min 08secs
9. Gilberto Simoni (Ita) Saunier Duval-Prodir +7mins 13secs
10. Danilo Di Luca (Ita) Liquigas +7mins 33secs.