@Jon-the clearance for true 650x42s is about 3mm. I say true because my experience with three different brands has yielded two different widths. Rene Herse 650x42s actually measure 40mm in width while both Panaracer Pari Motos and Gravel Kings measure a true 42mm, all on Velocity A23's.
Obviously the Rene Herse will give you close to 5mm clearance which to many is better. I prefer the 5 mm clearance myself but really like the Pari-Motos. I currently am running the Herse's on another bike, and since the clearance issues are with the chain stays and not the front fork, I may trying running the Pari-Motos on the front of both bikes and the Horses on the rear. You would not expect a 2mm width difference to matter much but it does add just a bit extra cush and on gravel adds additional stability and confidence. Also, a part of the discussion for your consideration should be brakes. There has been a lot of discussion on this, bob and 650b groups about the lack of stopping power of Tektro 559s, particularly when the brake shoes are at the end of the slot as is required for 650b conversion. I have not personally experienced lack of stopping power. I try to avoid riding in the rain, do not have long decents and perhaps my big mitts are strong enough to compensate for the lack of leverage. YMMV. On Friday, October 21, 2022 at 8:32:05 AM UTC-5 Will M wrote: > @Jon: I see you've had some good info about maximum fender/tire > clearances. For what it's worth, I ran my Ram > <https://www.flickr.com/photos/millhiser/36185050466/in/album-72157626161174071/> > > 100% on paved roads with the standard Rivendell Roll-y Pol-y 700x28c tires > and SKS P35 fenders (which max out at 28mm tires?). Worked great with > Ultegra side-pull brakes. > > Will M > > On Thursday, October 20, 2022 at 8:03:55 PM UTC-4 Jon Richardson wrote: > >> JP - I have wondered about having this setup as a 650b ride. To hear how >> you made this a convertible is very intriguing! I have mostly race type >> road bikes and am moving into a more useful all-round bike as I have had >> too many injuries. >> >> -------- Original message -------- >> From: MoVelo <jlpo...@gmail.com> >> Date: 10/20/22 1:52 PM (GMT-05:00) >> To: RBW Owners Bunch <rbw-owne...@googlegroups.com> >> Subject: Re: [RBW] Re: Fender size for a Rambouiller >> >> Im running 50mm SKS plastic fenders on my Ramboulliet when it's in fender >> mode. I switch back and forth between 700x32s and 650Bx42s so it's good to >> have a fender wide enough for both of those. >> >> It works really well given the location of the brake bridge in back and >> fork crown in front. Using Tektro 559s I simply slide the brake shoes to >> the bottom of the slot for 650B and then at the top of the slot for 700c. I >> did have to file the rear brake slot a bit to get the brake shoe low >> enough. >> >> It's almost as simple and operation as with disc brakes. Takes me maybe >> 20 mins to make the switch. >> >> I can't think of a more versatile bike than this Rambo. >> >> JP >> >> On Wednesday, October 19, 2022 at 1:27:47 PM UTC-5 ascpgh wrote: >> >>> I finally settled on RH stampede Pass tires on Velocity Synergy rims >>> under Honjo H-45 fenders and Paul center mount Racer brakes. Been riding >>> that Rambouillet on all roads that way for years. >>> Fendered '02 Rambouillet on 700x32 >>> <https://photos.app.goo.gl/7aUx9ZUx1iGtgsCM9> >>> >>> Andy Cheatham >>> Pittsburgh >>> >>> On Tuesday, October 18, 2022 at 8:20:13 PM UTC-4 Joe Bernard wrote: >>> >>>> IF you can get those wider fenders inside those brakes. My memory of >>>> messing with this on my Romulus is pretty vague now but it wasn't the >>>> easiest project I've ever embarked on. >>>> >>>> On Tuesday, October 18, 2022 at 4:28:22 PM UTC-7 Jon Richardson wrote: >>>> >>>>> Thanks, Peter! >>>>> >>>>> Appreciate everyone's help and advice. Looks like 28 or maybe 30s if >>>>> they are true to size and 41 to 45mm fenders should work. Guess the Jack >>>>> Browns are nice weather gravel for the Ram. >>>>> >>>>> -------- Original message -------- >>>>> From: Peter White <peter...@gmail.com> >>>>> Date: 10/18/22 3:42 PM (GMT-05:00) >>>>> To: rbw-owne...@googlegroups.com >>>>> Subject: Re: [RBW] Re: Fender size for a Rambouiller >>>>> >>>>> I'm firmly in Joe's camp. >>>>> >>>>> I use Challenge Paris Roubaix tires on my Rambouillet. They are >>>>> labelled 27mm but measure 29.5mm. My fenders are Berthoud carbon fiber, >>>>> only 25mm wide, but then this is my good weather bike. I would not >>>>> recommend anything wider than these tires with any fender on the >>>>> Rambouillet. 33.3mm would be very dangerous, in my opinion. If this were >>>>> my >>>>> bad weather bike, I'd be using the same tires but with the 41mm >>>>> Stronglight >>>>> anodized aluminum fenders. >>>>> >>>>> Peter Jon White >>>>> >>>>> On Tue, Oct 18, 2022 at 2:10 PM Joe Bernard <joer...@gmail.com> wrote: >>>>> >>>>>> Jon, >>>>>> >>>>>> You would probably need wider fenders for 33.3 and I'm not >>>>>> comfortable recommending it. These frames weren't designed for a >>>>>> fender/tire combination like that and the minimal clearance is begging >>>>>> for >>>>>> a bike-stopping branch to get stuck in there. >>>>>> >>>>>> On Tuesday, October 18, 2022 at 5:17:52 AM UTC-7 Jon Richardson wrote: >>>>>> >>>>>>> Thanks Joe! The description says for 20-28c tires, however I run >>>>>>> the 33.3 Jack Bs, do I need a wider set of fenders? >>>>>>> >>>>>> -- >>>>> 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-bun...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/rbw-owners-bunch/CA%2BD%3DXm8jG%3DYFXmyToGNBCAqDTgHjmeB4HjhtHJGc7-%2BFQCx8-A%40mail.gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/CA%2BD%3DXm8jG%3DYFXmyToGNBCAqDTgHjmeB4HjhtHJGc7-%2BFQCx8-A%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >> 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-bun...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/cf758554-888e-43a0-982e-c08b0e98e8f6n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/cf758554-888e-43a0-982e-c08b0e98e8f6n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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