Garth I haven't measured the chainline, but I can give you some info on what has worked so far with my Bombadil.
I used the XD with 46/36/26 with a 113 Phil centered. It worked flawlessly. I could have gone with a narrower bb, but I can't see why that would be an advantage. With the 113, there was good clearance and no shifting issues. I'm now using this set-up on my Atlantis and it works great with a 12-27 rear cassette for unloaded mountain rides. In an effort to get some lower gearing on the Bombadil, I took a TA Carmina triple that had originally been on my Atlantis (worked great) and put it on the Bomb. This crank was set up with 46/34/22 and TA rings. This arrangement also shifted wonderfully. In the process, however, I noticed that the 34 ring was well worn, so I got a replacement (Raceface). This 34t ring had slightly longer teeth and it rubbed on the chainstay!! I stuck a 119 Phil BB (centered) and it works great with good clearance and problem free shifting. I'll be riding this arrangement on a 1800 mile tour of the Pacific coast this summer. In my opinion, the Bombadil would be just fine with the XD crank, a 113 bb and a 46/36 or 34/ and 24 XD - cheap and effective. It is a MTB though and, unfortunately, there seems to be too much BB drop to run a 44 or 42/32/22 for standard mtb gearing. The front derailleur won't clear the chainstays. I find this to be an irritating aspect of Riv bikes and especially so with the Bombadil. With big tires, it would be nice to run the smaller rings for offroad riding and touring with a standard MTB derailleur instead of the Campy Mirage that RBW now uses to address the issues caused by the BB drop and bowed stays. I can live with the gearing as is, but it would be nice not to have to run an expensive crank on the bike just to get the 22t small ring. DC On Jun 9, 3:15 pm, Garth <[email protected]> wrote: > I guess it doesn't need to be an XD crank, as what I'd like to know is > what people are using for a chainline on their Bombadil, Atlantis or > even Sam frames. > > I asked about the XD because it's popular, and being a wider crank it > may need to use the wider chainline.. I'm trying to get an idea of > what I'm going to need,as I have no experience in triples for a frame > with such bowed stays. My '83 Stumpjumper used a road chainline of > 45mm, and the stays were parallel out of the BB, so ring clearance > was never a problem. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en -~----------~----~----~----~------~----~------~--~---
