Ballpoint pen springs probably weren’t on your list of unofficial-yet-essential LEGO Technic parts, but this bobber MOC (My Own Creation) makes a compelling case for raiding your desk drawer. The twin coiled springs flanking the front forks and tucked behind the rear wheel handle suspension duties with surprising visual authenticity. They compress and extend just like real motorcycle shocks, adding functional movement to a build that already nails the stripped-down bobber aesthetic.
Bobbers emerged from post-war American garages when riders started cutting away everything unnecessary from their motorcycles. The philosophy was simple: lose the extra weight, keep what makes it run. This LEGO version channels that same spirit with its exposed twin-cylinder engine, bare-bones frame, and that yellow racing tank sporting a bold number 8. The builder modified LEGO Technic set 42036 into something far leaner and more specialized, swapping the original suspension components for those ingenious pen springs and repositioning elements to achieve proper bobber proportions.
Designer: MadamMelodicRaisin104
The pen spring hack solves a real problem in LEGO motorcycle builds. Technic sets come with their own suspension systems, sure, but they’re often bulky or visually clunky at this scale. Real bobber shocks are these long, exposed coil-over units that sit right out in the open, part of the bike’s visual language. Standard LEGO shock absorbers don’t quite capture that look. They function fine mechanically but lack the visual density and tight coil pattern you see on actual motorcycles. Pen springs nail the aesthetics, which works perfectly for this MOC because visuals are everything. The Bobber isn’t entirely functional, but the suspension (even if static) looks the part.
Set 42036, the donor bike here, originally builds into either a chopper or a street bike configuration. Both versions skew whimsical, which works for LEGO’s typical audience but doesn’t scratch the itch if you’re after something with genuine mechanical credibility. The builder kept the core engine assembly and frame geometry but ditched the fanciful proportions. Bobbers sit low, with the seat almost directly over the rear axle and minimal distance between components. This build compresses everything into that tight package, pulling the handlebars back into a more neutral position and mounting the foot pegs mid-frame rather than forward where cruisers typically place them. Mid-controls make sense for bobbers because the whole point was maneuverability and quick handling, not long highway cruises with your feet stretched out front.
The kickstand correction might seem minor but it speaks to the builder’s attention to detail. The original Technic chopper configuration puts the stand on the right side, which is wrong for actual motorcycles. Real bikes park on the left because that’s where the shifter lives and you need clear access when you’re mounting from the curb side. Swapping it over takes maybe five minutes but it shows someone who actually rides or at least understands how these machines work in the real world. Same logic applies to adding the foot pegs, which the kit omits entirely. You can’t have a rideable motorcycle without somewhere to put your feet, even in miniature form.
The yellow racing livery with that big number 8 pulls the aesthetic away from typical black-on-black bobber builds and into flat track racing territory. Flat trackers are bobbers’ dirt-slinging cousins, stripped down for speed on oval dirt tracks. The color choice keeps the build from looking too generic while the racing plate gives it a story beyond “stripped motorcycle.” The tail section stays minimal, just a small seat cowl and rear fender. Nothing to disturb the clean line running from tank to tail. The fat rear tire balances against that narrow front wheel, classic bobber proportions that suggest power and grip where it matters most. Those pen springs keep catching your eye though, because they’re so perfectly scaled and so absurdly obvious that you wonder why more builders haven’t figured it out.
The catch, however, is that this Bobber only exists in the metaverse… or rather LEGO’s own virtual verse, called the LEGO Ideas forum. Designed as an online platform for LEGO enthusiasts to share their own creations and vote for their favorites. MOCs that cross the 10,000 vote threshold get sent to LEGO’s internal team for review, and if successful, get turned into a box set that all of us can buy! I don’t see LEGO launching kits that require dismembering ballpoint pens for their springs (because that’s technically an ‘illegal’ form of building a brickset), but I’m sure there’s a pneumatic Technic part somewhere in LEGO’s arsenal that will work. If you want to see that happen, however, step 1 is to cast your vote for this gorgeous build on the LEGO Ideas website.