It's the bigger one, the 54 that has the slacker 72 STA. The smaller one, the 52, has a steeper 72.5 STA
Maybe that's why you have it flipped? On Friday, August 4, 2017 at 2:31:06 PM UTC-7, John Hawrylak wrote: > > Bill > > I agree with your methodology. I'm a little confused on the 5mm > "adjustment" for the STA difference (72 on 52 and 72,5 on the 54). > > If the 52cm/72deg TSA shifts it's FC forward, wouldn't the 5mm be ADDED to > the 52 FC to get the 54 FC, i.e > > 54cm FC = 59.0 + 1.5 (TTL delta) + 0.5 (STA delta) = 61.0cm for 54cm frame > FC???? > > Either way, 60 to 61 is adequate since my current bike has 60.7cm FC and > about 5mm clearance to the P45 fenders > > John Hawrylak > Woodstown NJ > > On Friday, August 4, 2017 at 2:35:17 PM UTC-4, Bill Lindsay wrote: > >> In the absence of a measurement, you could do a rough estimate. >> >> Assume we believe that the 52cm 650B Hilsen has a 59cm front center. >> That's in the geo-chart >> Let's mutually grumble that there is no front center for the 54 or the >> 56. Grumble... >> But the 54 has the identical fork and the identical head tube angle. It >> also has the same BB drop. >> The 54 has a 1.5cm longer effective top tube, that adds 1.5cm to front >> center >> The 54 has a 72 degree seat tube angle instead of a 72.5. that shifts the >> BB forward by about 5mm, subtracting 5mm off of front center. >> From that I would estimate the 54cm 650B Hilsen to have a front center of >> 60cm. >> >> Bill Lindsay >> El Cerrito CA >> >> On Friday, August 4, 2017 at 7:59:22 AM UTC-7, John Hawrylak wrote: >>> >>> If anyone has a 54cm Saluki or AHH (650B), I would appreciate it if you >>> could measure and post the Front Center distance, distance from the crank >>> center to the front axle center. The RBW specs do not provide FC. >>> >>> Looking for a value of => 59.5cm to avoid TCO. >>> >>> John Hawrylak >>> Woodstown NJ >>> >> -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
