LEGO® Technic™ Dragster 42103 Building Toy Kit For Kids, Ages 7+

The dragster build/design is great. I recently built the roadster alternate design and I made one simple addition that really improves the look. On alternate instructions page 14, step 17, add tan pins (6013938, included in this set but not used in the alternate build) between the black pin and the gray #3 angle connector (one on each side). The tail lights (step 18) will rest on the tan pins at an angle instead of being loose or moving around. I think this makes the roadster's rear profile look really sharp!

Cool toy two in one is a nice add to the collection.

My son loves this lego set he plays with it all the time it work great

lego très intéressant pour un débutant ou un enfant assez facile a monter

I bought this set mostly because I liked the look of the alternate model - but it turns out tweaking the main one for ideal performance has been so much fun it could be quite a while before I get to that! First thing I noticed before I'd even given it a test run was the multiple heights possible for the wheelie bar; the instructions didn't quite get this across to me but fiddling around I found 2+ lower positions including one that *looked* too low by eye but turned out to be just about perfectly in line with the front & rear wheels. Then I had some trouble with the rear tires slipping on takeoff (even after cleaning the floor and tires - a little moisture improves the rubber/road connection); it seemed some slightly 'slicker' tires might be more ideal, but then I noticed the 42118 Grave Digger with its bigger tires was outperforming it. Looking around at other models in the house I found a pair of 49.5 x 20 tires (compared to the included 42.5 x 22) and was impressed with how much better it worked despite the narrower tires. The tread seems to grip better and the bigger diameter boosted takeoff speed, without noticeable 'wheelie control' problems. I'd like to try a little gearing along with some slightly *lower* 'slick' tires too before I move on the dragster build. Definately a lot of 'playing around' bang for your buck here! I'm looking forward to trying the 42104 Race Truck model as well,