SRB “SSS” Footage
3 Likes
from what ive seen of a max4 running in a big scale rc on 12s moving 100lbs of billet on hot days loll even still runs cool whatever they did to get thermals right its impressive
@deeznuts_pwned
With other motors, short track is where we build all the temps with constant quick accel and braking.
Weve been short track testing the 70/125 max4 single on 8s 38mph gearing.
On 12s the max4 gets really intense. Im sure with time on 12s it could be easily mastered. 12s changes the 8s 38mph gear to 60mph. 78/11 on 6" wheel
On 8s 70/125 single with max4 esc with 78/11 gearing it feels more like our xlx2 2028 setup.
The 70/125 560kv dual on 8s with the xlx2 and 38mph gearing performes like the 2028 8s with motor temperatures 10 to 15deg above ambient after several hard runs. Very cool!
5 Likes
Moving fwd with the Superspine gravity model.
We tested a few weeks ago with speeds upward of 52mph.
Though it is non powered, the SS design would be the first gravity raceboard inspired entirely from e-board track racing.
Our first tests were on our current downhill truck as well as the Superspine setup to build a comparison of grip balance between the 78mm topmount 3-link and 105mm wheel SS model.
The next round of testing will be adding our pat pending “Centerforce RTC” hanger to the 3-link. Centerforce has a mechanical return to center (RTC) when weighted utilizing the SRB 3-ling design features. We have e-board tested the hanger without bushings at 40+mph at AVS and broke the uphill record at Maryhill with it on our standard SRB 3-link. Looking fwd to testing and racing for Downill with the 3-linkRTC Centerforce. Will be bringing it to market as an add on for our current SRB 3-link truck design. Centerforce in completion will be a CNC aluminum product attatching the radius rod vertically with a bolt in design coupeling the spindle and hanger together. Currently we are in the process of raceproving the prototypes. The future is looking good.
Also in the works. We have been testing the 4" wide race slick for BRP. For our heavy racers we see improved ovarall grip with lower operating temps that produce longer runs. Should have some of these available in a few weeks on 45a rubber.
13 Likes
Holy craaaaap! A couple Hawaii riders and I were comparing different wheel/tires with the current BRP wheels/tires. We were amazed how narrow everything else was. Well, these new wider tires are going to make revisit that topic.
3 Likes
Are the wider tires on the same bearing seat spacing? How much of an offset is there? Any concerns about additional strain on the bearings or hubs as a result of the offset?
3 Likes
@Ac53n No concern and track tested. Wheel uses the same backspacing so it is a direct bolup on our current hub.
We use a 10x28 bearing set. The drive hub has a 54mm total bearing spread. Front hub is 10x28 bearing set on a 35mm bearing spread.
2 Likes
The superspine on the seismics 
1 Like
To me it looks like the mod is adding rake to your originally “rakeless” 3 links.
Is this different from the function of rake we see on other trucks?
Truck Geometry | Sabre Longboard Trucks UK (sabretrucks.com)
5 Likes
I might be headed this direction too. for my commuter. 3link, boardnamics, brp.
2 Likes
I debated for a while on what term the effect falls on. I have come to the conlclusion it is neither rake or caster.
When weighted it loads the radius rods and creates a mechanical return to center.
1 Like
I think it is basically just negative rake.
1 Like
I did indeed try it but wasn’t a fan. Worked out to about 0mm trail. Very divey at low speed and difficult to turn at high speed but not necessarily any more stable.
I think any form of undamped energy storage is bad for stability. In this case the road can energise the trucks by forcing them to return to center and overshoot.
Not to say this wouldn’t work well for some unique reason on the 3 links, but for caliber geometry I found it too difficult to turn at high speed for no real gain. In fact I prefer positive rake as it gives a stronger center feel and therefore more stability in my experience.
8 Likes
What makes you say it’s not rake?
1 Like
To me it doesn’t really look like rake, based on the rotational axis of the hanger
The SRB 3-link hanger has moment center. By design it uses 3 motions on its moment axis
Roll pitch and yaw.
With Dkp, Rkp, and channel you are working with a pivot center. The hanger does not roll or yaw. As you move the spindle center above and below pivot center this is how you change "rake"as described in the illustration.
If you move the spindle center above or below the moment center on the SRB 3-link RTC, all it does is change the ride height. The mechanical leverage and Return To Center function on the radius rods stays the same.
Did you even watch the video??
4 Likes
Doesn’t rake simply imply an offset from the plane that is coincident to the fixed points of contract (pivot cup and bushing/kingpin intersection in RKP, axle ball joint and nose ball joints in NKP) and parallel to the axis of the wheels, regardless of the position on that plane relative to anything else?