On Sunday evening an 'angry and frustrated' Smith strongly hinted that a tyre issue was to blame for his mysterious lack of pace in the Catalunya MotoGP.

In Monday's post-race test he backed up that hypothesis, rechecking his pace on a different old tyre before setting the second fastest lap time, just 0.040s behind Sunday's winner Marc Marquez.

"It seems to have been the tyre," confirmed Smith, who finished tenth in the grand prix. "We put a tyre from Saturday on the bike this morning and straightaway I matched the lap time from the race and actually ended up going about four tenths quicker just on that tyre.

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"So frustrating to say the least, but the nice thing is I didn't forget to ride between warm-up and the race... Just another bit of bad luck unfortunately."

The Monster Yamaha Tech 3 rider completed a massive 75 laps, the equivalent of three race distances and the most of any rider barring Suzuki test rider Randy de Puniet, who did not take part in the grand prix.

"We did a good job today," said Smith. "We just followed a program to test everything that we've tried in the last three or four GPs to clarify where we are and that everything is better. That includes geometry, front suspension, rear suspension, linkages, swinging arm lengths, electronics. A busy schedule. That's why I did 75 laps.

"We got there in the end and I'm pleased I improved my lap time from qualifying as that's not easy to do, especially in the test. We also seemed to find even better pace on old tyres. I was able to do mid to low '42s quite often. The track temperature helps, but I'll take that nevertheless."

Smith also liked the new hard front tyre from Bridgestone: "It's more like a medium plus. It's stiffer and does what it is supposed to do as a hard tyre, but we still have very similar side grip. It'll give us a real choice at places like Malaysia."