Search found 67 matches

by Farrina
27 Nov 2012, 11:00am
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

Thanks for all your comments and thoughts .... Whilst pictures cannot show sizing of the frames for those interested they can be viewed here https://skydrive.live.com/?cid=0E0F344CF39CA060&id=E0F344CF39CA060!113 Raleigh (blue) is obviously original frame. Note new frame has oversized tubing. Reg...
by Farrina
27 Nov 2012, 9:50am
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

Yes both are what might be considered as traditional lugged frames with horizontal top tubes. First one was built by Raleigh's specialist lightweight division circa 1986 (Gerald O'Donovan at SBDU - more here http://www.classiclightweights.co.uk/builders/raleigh-sbdu-builders.html ) I have been happi...
by Farrina
27 Nov 2012, 8:16am
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

Updated figures for top tube length - now properly measured as per advice kindly given

Old frame = 58cm
New frame = 65cm

So new frame my "stretch" to bars would appear to be 65 + 12 = 77cm as against 58 + 10.5 = 68.5 cm (second figure stem length)

Regards

Alan
by Farrina
26 Nov 2012, 10:18pm
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

So from centre of where seat pillar resides to centre point of fork column ?

.... Accepting this will be a rough measure but possibly more accurate than my original.
by Farrina
26 Nov 2012, 9:55pm
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

I seem to be causing confusion by talking about a top tube length of 54 cm .... I did say in my original post that my measurement as to this might not be correct but as I was using the same methodology it should not matter as I was comparing like with like. However it is quite apparent that this is ...
by Farrina
26 Nov 2012, 9:28pm
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Re: Frame geometry question - one for a frame builder ?

Forgive my ignorance but what are "front centres" ?

Regards

Alan
by Farrina
26 Nov 2012, 8:18pm
Forum: Bikes & Bits – Technical section
Topic: Frame geometry question - one for a frame builder ?
Replies: 30
Views: 1989

Frame geometry question - one for a frame builder ?

I am looking for some advice as regards frame geometry and my new frame as something appears odd. Scenario thus - sorry it's a bit of a novel ... I approached a local frame builder to build me a bespoke 853 steel frame based on my existing (25 year old) bespoke 531c frame. This old frame is what mig...