Thanks for the clarification, but I still think you misunderstand what Jan is recommending in the post you quote. In that post, Jan is specifically saying that a 60mm wide fender is intended to use with a 42mm tire. They recommend that the width of the fender should be about 20mm wider than the width of the tire. Even though I think Jan's post, separated from context, could be misconstrued, he has consistently recommended over the years that 10mm of clearance between fender and tire is ample and 8mm is acceptable. There's nothing inherently wrong with 20mm of clearance, except it would look kind of ugly. You'll never catch Jan saying you need 20mm of space between tire and fender. That's excessive for road use. You winter and mud riders may do well to have a lot more clearance, but for the rest of us, ~10mm is plenty.
On Sunday, December 13, 2015 at 5:03:35 PM UTC-8, ted wrote: > > Thanks Bill, > > Just for reference, in the 650B group Jan posted: > > "If you use these fenders with wider tires, you encroach on the clearance > between tire and fender. We recommend 20 mm between tire and fender for > safety. If you use a tire that is about 8 mm wider, you reduce that to 12 > mm. The bike will be rideable, but it's less than optimal. I wouldn't ride > a bike like that on gravel." > > Perhaps he feels 10 or 12 mm between tire and fender is acceptable and 20 > is optimal, but he clearly is recommending a 20 mm gap there. > > On Sunday, December 13, 2015 at 4:23:40 PM UTC-8, Bill Lindsay wrote: >> >> I think you may have misunderstood what Jan writes. The only place he >> goes all the way to 20mm of clearance that I know of is when you are >> scoping out whether or not you have clearance on your frame. He writes you >> shoudl have 15mm between the fork crown and the tire or the rear stay >> bridges and the tire, but then says 20mm is even better. Most people do >> not have 20mm of clearance between the tire and the inside of their >> fender. >> >> Most folks measure the clearance from the inner fender surface to the >> tire when they talk about their fender clearance. >> >> Some people like about 10mm from tire to fender. Some consider it good >> enough if their tire isn't rubbing. >> >> On Sunday, December 13, 2015 at 3:14:03 PM UTC-8, ted wrote: >>> >>> Jan Heine has written that they "... recommend 20 mm between tire and >>> fender for safety." >>> In the Roadeo write up RBW says you can put fenders over a 33.33mm tire >>> and without fenders can fit a 35mm tire. >>> That's only a 1.6 mm diff in size. I see lots of photos showing tire >>> clearance that look like there is a lot less than 20 mm there. >>> Most photos of fendered bikes I see don't look like they have that large >>> a gap either. >>> Do most folks really leave 20 mm (over 3/4 inch) between tire and fender? >>> Do most folks measure the clearance from the inner fender surface or >>> from the largest protrusion in there (e.g. mounting bolt for a light)? >>> >> -- 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 https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
