54cm Saluki - Front Center Measurement

[John Hawrylak]

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

[Bill Lindsay]

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

[John Hawrylak]

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

[Bill Lindsay]

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?

[John Hawrylak]

Bill

 

yes, I had it flipped.  The 54cm frame moves the BB towards the front vs the 52cm frame.

 

Thanks,  I'm going with a 60cm estimated FC

 

John Hawrylak
Woodstown NJ

 

 

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[Hiro Shimizu]

My 54cm AHH has 60.2cm. It is a Toyo made.

Hiro

2017年8月4日金曜日 23時59分22秒 UTC+9 John Hawrylak:

[Hiro]

John

It is 60.2cm with My Toyo made 54cm AHH. 

Hiro

2017年8月4日金曜日 23時59分22秒 UTC+9 John Hawrylak:

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.

[John Hawrylak]

Hiro

Thanks for the FC measurement.  I woul have NO TCO problems with a 54cm Saluki or AHH.

John Hawrylak

Woodstown NJ