Adding a 180 degree sloping turn to your experiment with other straight part behind and measuring part times of travel times would complicate the things, but with better results. My first attempt with suitable ball bearings was good for heavy cars, but light cars ran significantly better with the orignal LEGO train axle than with my ball bearing solution, and so I had to find a better solution. I can't find an existing thread, so while we can still sort of get the older metal axles I thought I should make sure the new ones really are improved. This is because the two wheels turn the same speed (same rotation speed), but they need to run different distance on a curve (the outer longer, the inner shorter), so the outer wheel will be dragged or the inner slipped.

You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this site. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH). It looks like the "record train" in the video had about 4 9v train motors at the front, but it is still impressive given the forces they overcame.com/a/PZ1Oo1I A few photos, one showing what's left of my layout after I removed the tracks for these tests. LEGO, the LEGO logo, the Minifigure, DUPLO, the FRIENDS logo, the MINIFIGURES logo, DREAMZzz, NINJAGO, VIDIYO and MINDSTORMS are trademarks of the LEGO Group. I'm thinking the video will be less slide show than last time and more of a "methods" section, with a summary slide and the rest here. I found some LEGO axles that can be assembled to MR52-2Z ball bearings without addtional tools, but after assembly the ball bearing still can move. I think the former is likely to be more important, so we get the wheels rotating independently more easily.

We design and 3D print LEGO compatible wheels and LEGO compatible rods to help further the LEGO train hobby. During these days from LEGO only standard wheels were available which didn't work well to build a steam engine.

The cheap ball bearings feel rolling roughly and I did not want to spend 2€ or more for a good ball bearing. Results with TrixBrix R72 curves (only 45 degrees of curve each way because that's what I have available). Wiggle track would be interesting, but also doing an "S" pattern with 90° turn into 180° counter-turn into 90° counter turn all on R40 track.

A speciality is the large train wheel from this era with 29 mm diameter (today this equals the "medium" size of BBB wheels).In my book, the guys at BMR are one of the most important resources for the Lego train hobby, first thing I thought of when I read this thread. They built up a track with only curved tracks used and run the same train from the same battery, only with the wheels differing.

Guess what, you can even find discount vouchers, coupons and other money saving deals of lego train wheel on AliExpress. Used in sets like 7897, 7939, 7898, 10183, 60197, 60198, 4841, 10173, 10219, 7938, 3677, 9467 and 7597. Using the first method results in a significantly different wheel holder height and I do not like that. Which is not bad at all: In 20+ years, these "axles" will be dead cheap on BL, should BL still exist.While introducing the grey 12V train system in 1980 the colour of the wheels changed to black and the wheels now were fixed to the modified 2x4 brick. If you can't find the perfect LEGO compatible wheels or rods then fear not - we also offer a design and print service for custom parts.