Bicycle tires are basically circles in cross section, as the tire gets wider it also gets taller. The width of the rim will impact the width to a certain degree, but not the height. Modern car tires a more like rectangles where the width and height are independent of one another.
Laing On Thursday, September 22, 2022 at 12:51:28 PM UTC-4 pi...@gmail.com wrote: > I went back and measured the height of my tires, and discovered that > indeed, the tires were 8mm taller on the Roadini than on my touring bike. > It's very strange, since these were nominally 700x28 or 700x30mm tires, but > measured only 27mm wide on the rims. I guess all the extra material on > "wider" tires went into raising the height of the tire (which is > undesirable) as opposed to increasing the width of the tire (which was what > I expected). Does this continue as you increase tire size? For instance, if > I got a 700x38mm tire, would I expect to it to end up being only 30mm wide, > but end up adding another 1cm to the height of the bike? > > On Monday, September 19, 2022 at 8:18:29 PM UTC-7 Philip Williamson wrote: > >> Without arguing against BB drop affecting handling and the perception of >> handling, I can’t see how stack can make a bike feel or ride “tall,” IF the >> bars are level with the saddle. I think the shorter reach makes you sit up, >> raising your head and giving you a narrower base (ass to grips) which I >> think might degrade balance on the bike. I’m much less “in” the bike on a >> smaller bike, even with the saddle and grips up. Jim Bronson also says his >> “tall” bike gives him a much more upright posture. >> >> The reason I think reach drives the “tall” feeling more than stack: In >> my mind’s eye I can put my hands on the bars, and the bike can grow or >> shrink vertically and the stem and seatpost can make up the difference. My >> position on the bike stays the same. If, however, I shrink the top tube, >> my hands move back towards my hips and my head and CG move up. >> >> I like to measure my bikes saddle-center to grip-center, rather than >> saddle-tip to steerer-center. >> >> Philip >> Sonoma County, Calif >> >> On Monday, September 12, 2022 at 5:47:59 PM UTC-7 pi...@gmail.com wrote: >> >>> >>>> I don't think a rider can meaningfully feel a 5mm difference in BB >>>> drop. I think what you are feeling is likely Stack related. A 54cm >>>> Roadini is a bigger bike than a 56cm RB1. Is your stem slammed? Slam >>>> that >>>> stem! :) >>>> If you want to split the difference, ride your Roadini for now, and get >>>> a deposit in on a Nobilette Roadeo. Sell the Roadini when it arrives, and >>>> off you go. I'm not sure if you'd prefer a 57 Roadeo, or maybe a 55? >>>> >>>>> >>>>>> >>> I went and measured the stack and reach on both bikes. Turns out my >>> touring bike actually has a higher stack (71.8cm measured from BB to >>> handlebar hood) and reach (45cm measured from BB to handlebar stem center), >>> while the Roadini had 68.58cm and 41.91cm on both of those measurements. >>> What is significant is that the BB height on the touring bike is 10.5" >>> while the BB height on the Roadini is 11", which is a 1.3cm difference. I >>> guess I can definitely feel a 13mm difference in center of gravity shift, >>> 5mm of which is accounted for by the BB drop difference, and then other 8mm >>> is accounted for by the bigger tires (which is strange since the difference >>> between tires is basically going from 25mm to 30mm tires, but 3mm >>> difference might be within the margin of error) >>> >> -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/894e76b8-789b-4932-8e6f-559d2f450a4bn%40googlegroups.com.
