Originally Posted by
juvela
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this manufacturer catalogue page of 1966 rates the Svelto as being able to handle a 24T large cog -
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in looking at the photo of the cycle it appears Holdsworthy employed the Prugnat 62/s lug pattern and the Vagner DP+ fork crown
do the frame ends carry any marking? wonder if they may have built with a Cyclo pattern...
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I have a Svelto on my Grubb that has the identical dropouts as on this C.B. and it takes a 28T low gear just fine.
Holdsworth went from Nervex to Prugnat in 1964 on its Grubb and C.B. lines (continued Nervex Professional for Holdswoth-branded bicycles).
Number would be on steerer tube and underside of bottom bracket.