You can use BikeCad to design bikes and it's pretty easy to get really close to the geometry of a real bike (angles unknown) just by eyeballing it. I did this with Riv's photos of the 52cm Clem and I wasn't off by more than .5 degrees on any angle. Plus, it's a blast to design your own bikes and the free version of BikeCad is plenty comprehensive for just playing around.
On Monday, November 16, 2015 at 8:02:50 PM UTC-6, Tony DeFilippo wrote: > > I've been enjoying my ~1970's, (possibly) Bob Jackson mystery frame w/ > 700x32 Compass EL tires so much lately I've been getting curious about the > frame geometry. It appears to have slightly steeper angles and definitely > has a compact rear triangle... anyway I took a nice clean profile shot on > my ride this morning and googled for measuring angles on a computer screen > this evening. Low and behold there is a Google Chrome browser Extension > called "MB-Ruler for Chrome". It's not perfect and I don't have any > illusions about the absolute accuracy of this method but it is fun to play > with. Maybe there are some other tools out there you've used and want to > share? > > I had to flip the photo horizontally for the HB-Ruler tool to be able to > read easier, to bad you can't flip the tool. These shot's are quick screen > grabs of the photo which I uploaded into flickr so I could use the chrome > extension on them from the browser. Not terribly necessary on your more > recent Riv's w/ known geo but might be a fun distraction messing around w/ > an older frame. > > > <https://lh3.googleusercontent.com/-gpJoMasonG8/VkqIQfJZ50I/AAAAAAAALPk/Ilw9AGcewgU/s1600/Bob%2BJackson%2BHT%2BAngle.JPG> > > HT Angle = ~74deg (this one was harder to measure w/o having a clear spot > to place the compass base) > > > > <https://lh3.googleusercontent.com/-Gc6WLfMdXE8/VkqIWhoOo8I/AAAAAAAALPs/Z-XTHSmCwio/s1600/Bob%2BJackson%2BST%2BAngle.JPG> > > ST Angle = ~73.4deg (i'm more confident about this one) > > > > <https://lh3.googleusercontent.com/-tiO_biMCuZk/VkqJqYlLx5I/AAAAAAAALP4/mPVtDd0xKkU/s1600/DSC_0361.jpg> > > > > <https://lh3.googleusercontent.com/-1uVcOQsn-Y0/VkqKbZOgsVI/AAAAAAAALQA/sqNIGqyUF8o/s1600/DSC_0356.jpg> > > > Two more w/o any angles shown... gorgeous crisp morning at my Mom's place > at Lake Waccamaw NC. I'm here through Thursday and plan to ride every > day... can't do better from a light perspective to what I saw this morning > though! I'm going to put out some blog/flickr posts later this week with > more of my favorites. > > > > > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
