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Hong Kong Model Car Classic Return
?Xpress? MRR2
1:10 M-Chassis Mini Racer
 
 
RC Man (HK RC magazine July 2007)
XPRESS Mini-Road Runner II
Following overwhelming success in the Japanese market and increasing popularity worldwide, the Xpress legend has now be revitalized and resurrected following investment and product development by Dinball Ltd.. Revitalizing the old version to hit the current chassis trend, the 2 newly upgraded M Chassis versions of Xpress are desired to carry on Xpress triumphant legend.
The major advancements of the new Xpress are a lower centre of gravity of the gear system and re-distributing the weight ratio of the major chassis components to give a 50:50 balance ratio. The body chassis is in silver dual-deck woven graphite that looks very appealing. On its body chassis, it adopts a popular left and right load balancing design. The most weighty components of batteries are on the right whilst motor with other electronic accessories are mounted on the left evenly which make the centroid move forward to an evenly balance ratio that well increases ground adhesion of tyres and hence improves its effectiveness and efficiency when turning.
The new version is adopting Xpress? parts and accessories that is aluminum in red color, very outstanding. The new version employs two identical front and rear gear boxes which are addressed with two lightweight ABS ball differential gears, connected with two durable 10 x 15mm bearings and a swing shaft transmission. The main gear shaft height of 20mm is greatly reduced from last generation of 46mm height (lower 26mm than before) and this is also lower than the other brand mini racers in the market.
As to the front suspension system, it maintains its own design that made of dual turnbuckles. This simple structure facilitates racer to adjust camber and caster angle at the same time. Near to the front of the upper radio plate, there are 3 additional holes that further increase the degree of adjustment to the caster angle. Besides, the rear toe-in angle is defaulted to be 1 degree and the toe-in angle can be further modified when upgraded with an option of graphite toe-in mount. The oil alloy damper mount is designed much lower and hence lower the centre of gravity of the car. Mini-Xpress MRR2 also upholds a distinguished direct steering system that simply links between power servo and front knuckle to minimize its tolerance and friction.
More important, the newly and improved version of Xpress still maintain and continue the flexibility and user friendly for upgrading as well as the convenience of interchanging parts and accessories, hence most of the parts and accessories are commonly used with the old version.
If you have a Junior Kit or if you have an old version of Mini-Xpress, it could be easily upgraded to a new version that can be equipped with ABS plastic gear box plus FPR junior racer body chassis and a combination of aluminum alloy gear box and woven graphite body chassis to a professional version of Xpress Pro. The main difference between Xpress Junior and Pro Kit is the material of body chassis. Junior Kit adopts FRP base plate and it?s more plastic parts and accessories but price is much affordable.
P.49
The front suspension system facilitates racer to adjust camber and caster angle at the same time and there are 3 additional holes near to the front of the upper radio plate that further increase the degree of adjustment to the caster angle.
The oil alloy damper mount is designed much lower, hence to lower the centre of gravity of the car. The front and rear oil dampers are 3mm thick.
2007 Mini Road Runner II and 2000 Mini Pro (right) are very different.
P.50
The new version of Mini-Xpress body chassis appears quadrangle, weight distribution is more balance, base plate is 2mm thick and lower centre of gravity of the gear system.
A newly designed alloy main gear adaptor is also installed with fixed supports on both left and right sides to prevent distortion.
The motor mount is with cavity that enables motor fixed even lower.
The new version enables motor mount fixed at lower position, which enhances gear shaft height reduced by 26mm and this is even lower than the other mini-racers in the market.
The body chassis is in silver dual-deck woven graphite that looks very appealing.
The new version adopts dish wheel that coated with red ring and wheel lock nut.
Body shell is not included in Xpress kit.
P.51
The local retail price is very affordable. It is expected that buyers overseas will more easy to accept this Xpress car structure and hence export sales are predictable to be far more than local sales.
The centroid move forward to centre, balances the weight distribution.
Junior Kit reserves the aluminum alloy motor mount and gear adaptor.
Motor with other parts and accessories are placed on the left except for batteries.
It?s very similar of the rear suspension system between Junior and Pro Kit (Junior excludes metal accessories).
The front camber is placed to the bottom of upper deck.
The metal oil damper is optional part.
Batteries position on the right that suit for any types of battery, flexible design.
Specifications :-
Chassis Length : 283mm
Gross Weight : 523g (Junior Kit)
515g (Pro Kit)
Width : 160mm
Wheel Base : 203 ? 210mm
Motor Gear Ratio : 3.605 ? 13.657
Camber : Front / Rear
Caster : Front
Toe-in : Front
Roll-Bar : Front / Rear
Down-Stop : Front / Rear
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