'69 BSA Twenty https://raleightwenty.webs.com/apps/photos/ '69 BSA Twenty Urban fixed-wheel lightweight Frame and fork mods: BB narrowed and re-threaded. Rear-end spread and filed for a modern track hub. Brake bridge flattened. Riv-nuts fitted for bottle cage mounting. Chain-guard tag removed. Head tube shortened and faced. Fork offset reduced. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992589 204992589 It's a BSA, from '69! The very early R20s have subtle differences to those from 1970 and later. Brake bridge is stamped ESGE Pletscher Patent, Made in Germany. Chain-stays are a different shape where they meet the BB shell. Seat tube is waisted. Seat post binder is welded on. Steering stop is an angled pressing. Black undercoat was used. This is the only BSA branded '69-type Twenty frame that I've ever seen. I like the evidence of age and use. I always do my very best to preserve original finish. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992590 204992590 A shame to ruin it...? Well, no. It came to me as a bare frame in pretty shabby condition. As a conversion to something much more usable than an old shopper, the bike will have a re-purposed second life. I'll be doing plenty of miles on this one. It rides smoothly and feels fast. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992591 204992591 At sunset A nice evening at last - after weeks of rain and snow! https://raleightwenty.webs.com/apps/photos/photo?photoID=204992592 204992592 Hockey stick is now a banana The reduced offset fork (blades straightened by 15 mm), along with a modern Aheadset, transforms handling. This Twenty can be ridden easily, even at low speeds, no-handed. Try that on a Twenty with an unmodified fork and the standard nylon-bushed headset! https://raleightwenty.webs.com/apps/photos/photo?photoID=204992593 204992593 I see no ships Build breakdown: Nitto bars. Acor lever. Tektro R559 caliper with Swisstop pads. Ritchey stem and post. Genesis saddle and tape. Campagnolo Chorus chainset. Shimano A515 pedals. Stronglight JP400 BB. KMC Z510 chain. System EX hubs. DT Champion spokes. Jalco rims. Surly fixed sprocket. Schwalbe Durano tyres. Snafu seat clamp. FRM C-Set head set. BMX seat post used as stem shaft. Blackburn stainless bottle cage. Home made seat tube extension and strut brace. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992594 204992594 Fixed gear 52/15 gives me a 70" gear, which can be spun along on the flat at a good pace, and also just about wrenched up the steepest local hills. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992613 204992613 Strut brace My saddle height is 790 mm (centre-BB to top of seat), which is on the high side for a 17" frame! An unsupported post at anything near to this height would be dangerous, as the post could easily fail. The lightest method of providing the necessary strength is to make a seat tube extender and brace it with a small strut. The lower mount was fabricated from steel plate. The strut tube was scrap from an old clothes drying rack. The extension tube is Reynolds 531 steel cut from the seat tube of a scrap road-bike frame. Metal joining is by simple silver-soldering with a plumber's gas torch. https://raleightwenty.webs.com/apps/photos/photo?photoID=204992614 204992614