2_i 

A while ago I bought a Sidewinder for Brompton:


that allows you to roll the folded bike laterally like a suitcase. In an add-on product for Brompton rack, that an average buyer must be able to mount, there had been some compromises. Thus the parallel movement of the folded bike had to be compromised with one of the original wheels moved to serve the lateral motion. The rear add-on wheel had to stick out very far to the side to prevent the rear rack from scraping against the ground. The original Eazy Wheels get beaten up quickly when only 2 of them support the bike in lateral movement.

Frustrated a bit by the imperfections in SideWinder I made one from scratch, retaining only the original idea, getting back the use of 4 wheels for longitudinal motion and using Bikegang skate wheels for lateral. I repositioned the wheels so that the rack stays parallel to the ground in lateral motion. This allowed me to put my lock bag on the nondrive side. (With the original SideWinder it rubbed against the ground on the nondrive side.) The nondrive location of the bag allows for the bike with the new lateral arrangement to be pulled up the stairs like a suitcase. The photos show bikes with the original (black) and remodeled (green) SideWinder (no original SideWinder parts are used in the latter though).

2_i 

The latest addition to the SideWinder Rewind is my version of the Kamoya Stick of which functionality I managed to deduce from Kamoya pages. It is basically an extended seat stop. If you lower the seat just a little bit, it will lock the fold and you can parade with your folded Brompton and the seat up, using it as a handle and not risking the unfold when rolling or lifting the bike over any steps and not needing any straps to keep the fold together.. Kamoya offers their stick cheaply, but only to Japanese buyers, so I had to attempt a reproduction.

Winfried

Apparently, Kamoya's Stick lets you lock the rear wheel without lowering the seatpost all the way down.

Someone should market your solution as a kit (side wheels + stick).

2_i 

When you lower the seat down a bit, of course it is generally not as convenient as the handle, as when it is more up. However, with Brompton, or anything else, it is usually the issue of negotiating compromises and, from such point of view, the Kamoya solution is pretty much good enough. Personally, I hated when needing to weave the strap through the fold to secure it.

DumplingsGalore

Hi there! Do you have a list of parts needed for your sidewinder mod? I'd love to do something like this on my Brompton Electric.

2_i 

I am detached from my Brompton still for a couple of days. The parts were stock bolts and alu bars. I will try to take photos and mark on them what goes where to the best degree I can without taking my setup apart.

DumplingsGalore

Thank you, that would be highly appreciated! I'm not the most handy person so just knowing what to look for is the key. I have a few extra wheels and bolts lying around, so I think it'd mainly be abut the bars.

2_i 

Apologies for this taking longer. I only now have some time to take those photos. The leftmost bike has the original Sidewinder installed, the central one has my version, and the rightmost is in the standard Brompton configuration. The rightmost bike is post-2018, and the two others are pre-. If you need any more close-ups of my version or the original, please ask.