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  • Constrictor Osgear
    25s or with triple cog free wheel 30s Above is an image of the drive train of a four speed Osgear mounted on braze on fittings This Osgear is the model with a de tensioner cable which can be seen going over the bottom Bracket On this version the cable has a nipple at the bottom where it clips to the tension arm and then travels through a piece of floating outer cable to the outer part of the down tube lever where is is secured by a bolt With a band on tension arm there is a clip to hold this short piece of outer cable Here is an image of the drive train of a 1951 Gillott owned by John Spooner It started as a 4 speed Osgear and was converted to 6 speed has anyone else managed to do it plus a Benelux rod changer on the front This is the Osgear with a tension adjuster on the sprung arm and a second lever to reduce the chain tension for that extra bit of speed It has Mil Remo steel cottered cranks with possibly Mil Remo rings John says he drilled two extra holes in the gear lever to accommodate the extra gears Aub Denham writes I was interested in the article on Osgear The photo left shows an Osgear with a 5 sprocket block and double chainwheel A fixed arm was constructed so that the tension arm pivoted from beneath the bottom bracket The frame is a Barnard the bars Bartali There were 3 of us in the Streatham C R C who had Osgears at that time circa 1952 One of the others I recall was Ron Hawes This Barnard didn t have a brazed on bracket although I m sure that as it was built to my own spec I could have had one brazed on incidentally the frame cost 12 10s The position was altered by making a little arm I think it was about 3 long which was attached to the bolt on clip The photo was taken by Ted Lees the event was the Streatham C R C s club 25 in 1952 24th August 2009 Would Aub please contact Cecil Potterton at CJPott at blueyonder co uk as we have lost Aub s email address and Cecil wishes to contact him again after 50 years Bernard Howard relates I rode an Osgear 1950 54 with the BLRC Modifications were as already commented upon i e an extension bracket approx 3 ins long welded vertically below bottom bracket I thought the original clamp on bracket was useless Although this meant the tension arm was moved backwards and lowered it gave a wider choice of sprocket sizes Chain length had to be adjusted so that the arm chain guiding wheel although much lower than normal didn t touch the ground when on the smaller sprockets chain ring Mind you there was only about an inch clearance in this situation I also drilled

    Original URL path: http://www.classiclightweights.co.uk/osgear.html (2016-02-09)
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  • Overhill 'Massed Start' gear
    The sprockets on the spring arm look very similar to those used on Cyclo Standard or Ace The operating cable goes all the way to the inside end of the fork arm and simply pulls against spring pressure and the whole mechanism looks vulnerable to weather and road grit The top tube lever is simply made by folding some shaped aluminum sheet over to double the thickness Fabrication as you can see has the air of a school metal shop project or at least back when I went to school and is somewhat similar to the materials and methods used to fabricate the Bantel Manx brake calipers My understanding is that these gears were only made for a few years and I have seen adverts in Cycling around 1950 mentioning price reduction On the left is an advert from Cycling Supplement 11 August 1948 I have been told that Overhill Engineering Co Ltd Holton Heath Poole Dorset remained in business for many years after the production of bicycle gears ceased and that at least in 2006 the building was still standing although neglected with the last occupant using it for a business importing antiques from Europe The V CC has an Overhill Catalogue in their archives The scan of the advert is from August 11 1948 Cycling and the pdf is a scan of the catalog is from V CC archives via Ray Miller Although a very simple gear setting it up was not straightforward since it only wanted to be a 2 speed and not the 3 speed that it was supposed to be this despite following instructions and tweaking the few available adjustments Being short of time and a bit of a bodger I got round this problem by installing a 5 32 x 5 speed freewheel with

    Original URL path: http://www.classiclightweights.co.uk/components/overhill-comp.html (2016-02-09)
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  • Resilion Crimson Star derailleur gear
    sprocket This was the last derailleur gear produced by Resilion The red nylon pulley wheels red behind the logo and the crimson star badge no doubt gave the gear its name Mick Butler contributes Resilion Crimson Star gears were British made and common in the early 60 s especially on lower end mass produced lightweights Normans Phillips etc The red jockey and tension sprockets were very simple to remove If I remember correctly they had no cones fitted which simplified care and maintenance The gear arm was pivoted so that you could swing it out of the way to help in wheel removal Think you could easily get the wheel out on any cog because of this The toggle chain was shrouded for protection against damage see advert scan The real beauty of this gear was that they would operate on either 1 8 or 3 32 chain and were suitable for 3 4 and 5 speed blocks Absolute godsend for us young tandem riders when we junked our old twin wire Cyclo Standards and with a Baylis Wiley Freewheel hub unit fitted sheer magic They could handle a ten teeth difference typically 14T to 24T Chain tension was regulated

    Original URL path: http://www.classiclightweights.co.uk/resilioncrimsonstar.html (2016-02-09)
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  • Gian Robert gears
    on close ratio 5 speed blocks say 14 18 but when used with wider ratios 14 22 the gear would bend rather than change from sprocket to sprocket In the following eight to ten years the Campione was produced in steel which probably elimnated the bending problem Gan Robert Competition The second gear is the Competion above produced in 1978 along with a very similar gear called System The Competion was a much more sold gear and a nice touch was that the adjuster screws were part of the main body rather than exposed like most other gears However I still found problems with wraparound when using larger sprockets so eventually the gear was retired to the old bits box The last gear produced was a very smart piece of equipment called Exploit sadly I have no picture of this model but it was very similar to the Campagnolo and Shimano gears of the early 1980 s The gear lever above is of similar style to the Campagnolo of the 50 s 60 s and 70 s the down tube clip differs but I think it is quite a nice clip Paul Gittins notes I have read Terry s article on Gian Robert mechs and am interested to see that he has one of the plastic versions still in one piece A clubmate of mine got one when they first appeared and I recollect that he had the same experience as Terry a reluctance to change under pressure Interestingly I also recollect that his had a white body rather than the black of Terry s I m attaching a scan of a Ron Kitching advert left for the Gian Robert plastic mech Mick Butler adds Gian Robert was more famously known for the tools they manufactured especially their chain pliers

    Original URL path: http://www.classiclightweights.co.uk/components/robert-harradine-comp.html (2016-02-09)
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  • Rod front changers
    for adjustment The 1947 version had a steel top gate later changed to an aluminium casting as shown here Below Two images of the Tour de France in use left 1948 with drilled cage and right doubled up with Campagnolo Corsa gear SIMPLEX Competition dual control versions 1949 Left Two views of the Simplex Competition dual control FD with simple cable stop on the band and cable pinch bolt Right

    Original URL path: http://www.classiclightweights.co.uk/components/changers-mark-comp.html (2016-02-09)
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  • Simplex gears
    in aluminium and chromed steel inner ring in blackened steel 4sp freewheel flat and off set chainring adaptors Bottom row c1949 Tour de France front changer early 50 s Competition front changer late 50 s Competition front changer length of genuine Simplex cable c1952 cage chainguard for Competition front changer gear levers single RH lever double RH lever double R L lever Simplex 543 rear changer A 1954 Simplex 543 in the double cable format Simplex expected this model to give them a huge step ahead of their competitors As its name suggests the gear can be set to change three four or five gears by setting the indicator arm to whatever sprocket range was being used It had a range of 22 teeth front and rear On this model the second cable adjusted the chain tension as required Champion du Monde interim model Here is a rare early post war Simplex gear changer In 1946 Simplex produced the single pulley Champion du Monde In 1947 they introduced in this interim model a second spring loaded pulley to improve the chain wrap this was done by adding tension to the chain between the lower pulley and the engaged sprocket This

    Original URL path: http://www.classiclightweights.co.uk/simplex.html (2016-02-09)
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  • Simplex Competition front changer
    Reminiscences Photo Gallery Ride calendar Links to related sites Simplex Competition front changer Author Peter Underwood A self explanatory exploded view of the Simplex Competition front changer This version has an alloy knob later ones have a plastic version This

    Original URL path: http://www.classiclightweights.co.uk/components/simplex-competition-comp.html (2016-02-09)
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  • Simplex JUY 51/53
    Riband Both the tension cable and the gear cable share the same outer rear of the chainstay cable eye The tension cable is attached to the gear cable by a pinch nut and bolt just ahead of the chainstay cable stop The second cable helps the inner coil spring to increase the chain tension To make a thin tension cable first cut a length of approximately 12 of conventional brake

    Original URL path: http://www.classiclightweights.co.uk/components/simplex-juy-513-comp.html (2016-02-09)
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web-archive-uk.com, 2016-10-22