FT: Frame (Twin) Help needed, Seat frame fixing points distance between eyes

Spqreddie

Well Known and Active Forum User
VOC Member
Hi All!
I am buildign a new seat and ordered a new frame kit from the Spare company (actually two, I had to return a first one as was not really well done, but in the meantime the manufacturer has changed and got the current one), but it doesn’t match the old one (which,as well, I think is not an original one), so I would like to check the measurement with you as I am afraid the damping geometry will change if not fixed correctly.
I can extrapolate the width by the RFM mounting points (20cm), but I would like to know the distance between eyes of the seat frame between the UFM mounting point and the seat stays mounting points.
Thank you! I was not able to find it on Know Thy Beast or other reference.

Best,
Eddie
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vibrac

Well Known and Active Forum User
VOC Member
It's a bit like poetry it never translates properly from its native tongue the Vincent was built by imperial measuring with the normal dispensation to the French because they did play with engines around 1900 so we kept their bore and stroke apart from USA where cubic inches ruled.
So if it was built with inches it's only sensible to use inches thankfully with a digital guage and metric dials on the lathe I can use the devils stick but I certainly try and describe Vincent's in their proper tongue
As for cc, being a bit of a triumph fan I remember that 350cc. Is 21 cubic inches I wonder why?
 

Bill Thomas

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VOC Member
Well I never knew that, Triumph 21 !!.
So what about a Tiger 90 350cc, I was thrilled with a short ride on a White new Tiger 90, When I was 15 years old !, What a Looker !. Cheers Bill.
 

vibrac

Well Known and Active Forum User
VOC Member
Using a Tiger 90 with a 500 top end I managed to get the weight down to 300 lbs and got a gold award on the Lands end Trial I fitted an alloy tank but kept the steel one. Years later when building up a 650 Trophy i was stuck finding the small tank that was fitted by the factory I remembered the T90 tank and was amazed to find that was what the factory had used in 58 and reused (the pressings ?) with different fittings on the T90 years later.
 
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