Due to the corona situation, I ended up staying on my ship another 5 weeks or more, instead of going home two days ago. Which means I have more time to play around with various ideas, most likely good and bad.....
For me, reducing the weight of any bike is always a goal, especially on already light bikes like my RD350. So I was just surfing around on eBay, and came across loads of carbon fibre seat posts for bicycles of all sorts. (Bicyclists are worse weight fetishists than even the most hardcore motorcycle builder).
These seat posts are basically a carbon fiber tube, with a seat mounting bracket at one end. I am pretty sure one of these seat posts could be used for making a very lightweight side stand. Just cut to length, glue in an alloy or plastic pad at one end, and an alloy adapter/socket at the upper end. I will definitely order a couple of cheap seat posts just before travelling home, whenever that may be.
id be curious to see how this works. the issue i would have had concern with was it cracking/breaking at the mount/pivot, thats a LOT of pressure at that joint. Im sure it will work though, looking forward to seeing how it goes.
As a former and kind of current cyclist who built a weight weenie bike, I can say yes some cyclists are obsessed with every tenth of a gram. The difference between riding a 28lb mountain bike and an 18lb one is tremendous (if they are equally capable). Personally i would just get some CF tube and machine a pad and mounting hinge and epoxy them into the tube. If you are more capable with CF than go for it, I see no reason why it would not work if designed properly. My CF mountain bike frame, even with the rigid CF fork, has taken massive hits before. And its just a cheapie China bulk frame.
I wonder if that new Ducati Panigale that's like a 100k has one of those. I do know it's frame/swingarm and wheels are made of carbon fiber as is the body parts.
Seems just lopping the arm of a standard kickstand and leaving enough of a stub to epoxy into an appropriately sized CF tube wouldn't be too hard.
Losing a few pounds off the rider would probably be a lot easier.
Quote from: m in sc on March 20, 2020, 08:12:19 AM
id be curious to see how this works. the issue i would have had concern with was it cracking/breaking at the mount/pivot, thats a LOT of pressure at that joint. Im sure it will work though, looking forward to seeing how it goes.
I was thinking I could use a piece of SS hydraulic tubing for the pivot end, and machine a slight taper at the end inserted into the CF tube. Just to avoid a stress raiser at the end of the tube. Maybe even a 2 or 3 angle taper. That way, the highest bending loads would be in the section made of 316L steel, which should be fine.
And make an aluminum pad for the other end.
Still at work offshore in Angola, and will have to stay onboard for another 4 weeks at least. Flying home is a no-go now, so will have to sail home with the vessel.More than 5500 nautical miles.....
Cannondale built a bicycle that used aluminum tubular structures at all the joints and bonded carbon tubes to connect it all together. As far as I know there was no taper, just a tight fit and epoxy bonding. What they ran into was oxidation of the aluminum that resulted in gradual de-bonding, most of those frames started to fall apart after maybe like a decade and I doubt many are rideable these days. The oxidation stuck to the bonding, the tube slipped out.
Stainless might solve that issue, but to what end? A fabricated aluminum or steel tubular stand will likely be strong enough with only slight weight gain, but without all the expense and hassle of a carbon and metallic structure. A light RD is like 250lbs, if it's leaning at a fairly steep angle it's not likely to put more than 50lbs on the stand. If you kick start it with the stand down you could put a fair bit more weight on the stand, but even still, it's likely to be less than 200lbs as you are still sharing the load with the two wheels. A really thin but large OD tube in either aluminum or steel will withstand that, and do it without the concerns related to a carbon tube. The frame side mounting however will have to be quite stout, and will be rather heavy. If you are that concerned about weight, get rid of the stand all together and find a tree or fence to lean the thing on between races.
I needed to lengthen a GT750 sidestand recently, so I cut off both ends and trimmed them and welded them into a Chrome moly tube. Much lighter than stock. Not as light as CF but with my limited skills it was possible.
Quote from: sav0r on March 27, 2020, 12:39:26 AM
If you are that concerned about weight, get rid of the stand all together and find a tree or fence to lean the thing on between races.
No side stands on racebikes anyway. Most governing bodies don't allow them.
See no problem with doing that other than may look a bit out of place. Leaving the tips would make things easier for you. Find tubing to fit. Its not hard to find in specific tubing rather than bicycle parts on the net.
Quote from: pdxjim on March 27, 2020, 02:02:33 PM
Quote from: sav0r on March 27, 2020, 12:39:26 AM
If you are that concerned about weight, get rid of the stand all together and find a tree or fence to lean the thing on between races.
No side stands on racebikes anyway. Most governing bodies don't allow them.
I was being mostly facetious with that comment.