CG83
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Photos: 11
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Forum replies: 2
Comments: 21
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Costa Mesa, CA, USA

Member Since:
10/5/2009
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CG83 Added a comment about photo Electronic Shifting Gboxx2 Prototype DH Bike

10/16/2014 7:44pm
Electronic Shifting Gboxx2 Prototype DH Bike
Electronic Shifting Gboxx2 Prototype DH Bike
Lessons learned: 1. It was definitely ideal to build multiple frames at once to save on machining and materials costs. We were also able to build alpha and beta protos this way. 2. I underestimated how annoying the chain tensioning would be. I should have designed a really simple roller tensioner onto the swingarm and made a standard thru-hole drop out. 3. The reduced unsprung mass and centralized CG made the bike ride a lot lighter than it actually was at 41.5lbs. 4. The G-boxx II unit was awesome because it was available, nicely made and functioned well, but it...
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CG83 Added a comment about photo original_92314410_1254804955.jpg

10/16/2014 7:25pm
original_92314410_1254804955.jpg
original_92314410_1254804955.jpg
The shifting system was fully custom. Onboard li-po battery, shifting logic via arduino board and a high torque RC sailboat servo for the pull-pull shifting system. Shifted while coasting, brakes locked up, or pedaling...
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CG83 Added a comment about photo Ceramic bearings

10/16/2014 7:23pm
Ceramic bearings
Ceramic bearings
The rear wheel ended up lighter than the DT-Swiss 240 front. With the savings at the wheel, and removal of the derailleur, the suspension was working with a good 1.5lbs less mass, unsprung.
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CG83 Added a comment about photo Electronic Shifting Gboxx2 Prototype DH Bike

10/16/2014 10:34am
Electronic Shifting Gboxx2 Prototype DH Bike
Electronic Shifting Gboxx2 Prototype DH Bike
It's still around, though in need of some fork and brake love. Definitely considering using my lessons learned for another gearbox project, but it hasn't happened yet! thanks for the mini-showcase!
This photo has 12 comments.

CG83 Added a comment about photo original_scurrafork.jpg

9/20/2013 7:05am
original_scurrafork.jpg
original_scurrafork.jpg
Don't forget that every bike, single pivot or linkage, has inherent anti-squat properties! This is why most single pivot bikes (at least the ones without an idler) have the pivot in generally the same location. That is a spot with a good balance of pedaling and wheel path properties. Linkage bikes just have a bit more flexibility in controlling how the anti-squat progresses through the travel. Also, during breaking, it is "Anti-Dive" as opposed to "Anti-Squat". Glad some people are thinking a bit more critically about the design instead of completely blowing it off!
This photo has 44 comments.

CG83 Added a comment about photo original_scurrafork.jpg

9/20/2013 7:01am
original_scurrafork.jpg
original_scurrafork.jpg
Correct, but since your steering axis and wheel path are independent, you can maintain the trail value, which depending on what you are looking for, is potentially more important than steering axis angle during large compressions
This photo has 44 comments.

CG83 Added a comment about photo original_scurrafork.jpg

9/18/2013 11:26pm
original_scurrafork.jpg
original_scurrafork.jpg
Its actually not really about wheel path at all. There are a few reasons to explore a linkage on the front of a bike, but the primary one is to be able to tune the anti-dive dynamics in the front end. If you get anti-dive values correct, you have the potential to keep the front suspension completely active under braking, without diving, no matter how deep the braking bumps. The one main problem with this is rider feel, and the sensations that all riders are used to feeling while hitting the brakes into the corner. In addition, with a design...
This photo has 44 comments.

CG83 Added a comment about feature Race Report: 2013 VP EnduroFest

5/2/2013 10:16am
Profile picture for user CG83
Profile picture for user CG83
Unfortunately upon seeing the mess that was being created when the faulty results were being posted, and the fact that I wouldn't be attending the podium, my wife and I headed out. Sounds like we missed out on some good TMZ drama. A bummer because after the snafu was resolved, I ended up in 4th (instead of the original 8th that was posted), so I missed out on a chance to podium and get some free stuff. Oh well, the racing was fun, beautiful day out there and I certainly got a good work out from all of the sprinting.
This feature has 11 comments.

CG83 Added a reply to offset shock bushings for slacker head angle

3/16/2011 10:51am
Who needs engineers for suspension and frame design anyways? There are quite a few variables that these bushings effect in the geometry and handling department. In my opinion, it is a little too broad stroked of a design to be implemented for all bikes.
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