How badly were you and the bike hurt in the crash? --Shannon On Monday, September 1, 2025 at 7:56:07 PM UTC-7 Steve wrote:
> Shannon, I like your advice. Indeed, now that I think about it, the > current 3x drive train runs a bit slack in the 24 x 11 combination. I > will confess though to having been "bone headed" enough to once seize a > derailleur in the big x big position -- which taught me to check the > chain in that position when setting up a new drivetrain. > > Steve > > On Monday, September 1, 2025 at 9:17:52 PM UTC-4 Shannon Menkveld wrote: > >> Exceeding chain wrap on a derailleur isn't a big deal. The worst that can >> happen is that you upshift into a too-small cog on the granny ring, the >> chain goes slack and makes hella noise, and you shift the front and feel >> like a moron. >> >> My 1985 League Fuji is set up 45/42/30 x 14-16-18-20-23-26... with a 1980 >> Suntour Superbe that's spec'd at 23t of chain wrap and a 23t max cog. Other >> than the shift up from the granny, which needs to be done nicely and >> slowly, (but when was the last time you needed to shift up off the granny >> *right >> fringgin' now!!*,) with the Riv Silver 1 shifters on the downtube, it >> shifts better than I do. >> >> As long as your derailleur can handle it when you boneheadedly try to >> downshift to the bottom cog on the big ring without locking up your >> drivetrain and making you crash so fast that time won't have time to slow >> down before you hit. (I guess that's possible going the other way, if you >> got the chain so slack, under so much pedal force and speed as to wrap it >> around the bottom bracket like a fishing reel, but any situation where I >> can imagine that happening would be really really weird...) >> >> Tl;dr: I'd Just Do It (tm). It'll almost certainly work, and if it >> doesn't, you'll just hate it and do something different, so no harm done. >> >> --Shannon >> >> On Monday, September 1, 2025 at 4:16:06 PM UTC-7 Steve wrote: >> >>> Thanks Eric. Another group member tipped me off to this photo from the >>> article, but I couldn't quite make it out. Looking at it now I think you've >>> deciphered it. If this is the final capacity - and I'm guessing it is if >>> Riv went to the expense of having the boxes printed - the current 3x >>> drivetrain on my Platypus will exceed its specified max chain wrap. I may >>> have to wait for the Sam Hillborne I've been contemplating for my next >>> birthday. If I hear anything different from the inquiry I finally sent >>> Will at RBW, I'll share it here. >>> >>> Steve in AVL. >>> >>> On Monday, September 1, 2025 at 1:46:03 PM UTC-4 Eric wrote: >>> >>>> If you zoom in on this photo from Eben Weiss' Outside article >>>> <https://www.outsideonline.com/outdoor-gear/bikes-and-biking/rivendell-bikes-rear-derailleur/>, >>>> >>>> you might be able to make something out through the jpeg haze. >>>> [image: image.jpeg] >>>> I think I'm reading Biggest cog of 36T (with friction shifter) and 34T >>>> (with index shifter) and a Chain wrap of 39T. The largest cassette cog >>>> numbers sound about what I'd expect, but I have no point of reference for >>>> chain wrap. So, I'll let someone else jump in as to whether that number >>>> makes any sense. >>>> >>>> Of course, all of this is prototypey and, I assume, subject to >>>> yaddayaddayadda... >>>> >>>> Eric >>>> SF, CA >>>> >>> -- 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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/rbw-owners-bunch/dab61437-33cd-40ca-9f3f-0b964a2562ccn%40googlegroups.com.
