April 17 2012.

There will be a once in a lifetime opportunity to see three of the rarest and most powerful classic bikes ever built at one of Britain's biggest motorcycle shows.

A trio of American Crocker machines will be displayed at the 32nd Carole Nash International Classic MotorCycle Show at Stafford County Showground on April 28 and 29.

Bonhams will be offering show-goers a glimpse of the much sought-after V-twin bikes before they are whisked away back to the US and auctioned off - most likely never to be seen on these shores again.

Just 100 or so Crocker V-twins, designed to top 100mph and defeat the Harley-Davidsons and Indians of the day, were manufactured between 1936 and 1941 and since then they've become the Holy Grail of American classic motorcycle enthusiasts.

It is believed that just 68 examples of the V-twin survive today. One is owned by American chat show host Jay Leno and another, which belonged to film star Steve McQueen, was sold at auction in 2006 for £175,000 ($276,500).

James Robinson, editor of The Classic MotorCycle, said: "This is an incredibly rare opportunity to see three Crockers together in this country. They were hand made in extremely low numbers for a very short period of time and of those that were made, not all have survived the ravages of time.

"Americans regard Crockers as a national treasure and you can certainly see why."

All trades and club stands for the Carole Nash International Classic MotorCycle Show have now been filled - a total of more than 800 plots - so visitors can expect a superb mix of displays to examine, stalls to peruse and attractions to enjoy. There will also be a chance to see racing world championship legends Giacomo Agostini, and John 'Mooneyes' Cooper.

Another attraction is the Classic Racer Grand Prix Paddock. This will feature snarling race-bred beasts of the track including a choice selection of 1970s Triumphs, BSAs, Suzukis and Yamahas.

In addition, a demonstration of the gentle art of trials riding will be given by Classic Dirt Bike editor Tim Britton with Yrjo Vesterinen and Mick Andrews. Vesterinen won three world championships, in 1976, 1977 and 1978 and has taken numerous other titles. Andrews has won the Scottish Six Days Trial five times and has several ISDT gold medals.

Show organiser Nick Mowbray said: "We've crammed more into this year's show than we ever thought possible before. It's going to be a feast for the senses with the sights, sounds and smells of classic machines of all eras all around. We've got some great special guests coming and motorcycle enthusiasts will not be disappointed."

Gates open at 9am on both days before closing at 6pm on the Saturday and 5pm on the Sunday. Pre-booked tickets for the show cost £10 for an adult, £8.50 for seniors and £3 for under-15s. On the gate it's £12, £10.50 and £4.

For more show information visit www.classicbikeshows.com or call 01507 529529.