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Are Triumph 650 and 500 front ends the same

Discussion in 'Triumph (Classic)' started by nortriubuell, Aug 10, 2019.

  1. nortriubuell

    nortriubuell VIP MEMBER

    Aug 29, 2010
    Surely some Triumph experts out there ... are the 1963 to 1970; Triumph 500 front ends (forks triple trees, front wheels, etc) the SAME as on the same year Triumph 650s?
  2. Matt Spencer

    Matt Spencer

    Jul 25, 2010
    Dunno but met a few people who thought the Daytona front end on a 650 was a hot trick .

    one rode one thru Canada and US on holiday , other was a rustic in N Z .

    Likely the daytona springs are a little softer , so for a 10 stone rider

    carving up bends'd be easier as the front , if dropped , would steepen the rage .
    A 15 stone rider , or touring loaded , maybe the 650 springs'd be required . But wrnt. in the first instance. Or second .

    So just throw em on . Reframing a oil tube with the 60s frame was often done . Alloy forks etc into a single tube frame .Seen Triumph disc front end ona Comando too, so inverse dosnt look impossable .

    Tri went to Shuttle Valve dampening around 70 . ( or 68 ? ) so a 74 Daytona front end was the one usually spoken off.
    All bits are dimensionally much the same .
    Was evwen a ' KIT ' for Earlier T.L.S. Fr Brake into alloy forks - as wider triple clamps . axle and NECCESARY longer
    tourque stop . Two widths Norton triple clamp / staunchion centers , too. Early & post 70 Commando .

    One could do custom ' classic ' Tri Forks , BSA / T 150 ? Norton Dia Staunchion & Clamps with the Iron Tri Lowers with maybe Norton ( or aftermarket now ) Norton Dampers . For Appearances on a hot Pre Unit .

    Lookata Early Rickman .
    T 100 Roadholder BSA framed M X Special .[​IMG]

    Not to mention the Royal Oilfield in the Backgound . Series 3 with Roadholders ETC

    All you need is a really big hammer ! . o_O
    nortriubuell likes this.
  3. Fast Eddie

    Fast Eddie VIP MEMBER

    Oct 4, 2013
    I believe the forks are the same but some 500s had a smaller front brake, same TLS design, just smaller. Later ones went to the same size (which they shudda done all along). I’m not sure of precise dates of these changes though.
    nortriubuell likes this.
  4. kommando


    May 7, 2005
    What Fast Eddie said, from 69 onwards they had closer matching brake sizes but you have to check as there were 7" and 8" flavours of the TLS brake plus some have 18" rims and some 19" rims depending on engine size and selling territory.
    nortriubuell likes this.
  5. Matt Spencer

    Matt Spencer

    Jul 25, 2010
    Thinking maybe the 500 stauchions could be a inch shorter ?

    Bit like the long & short Roadholders .
    Was in classic bike centuries ago a Norvin with Long ( Commando ) roadholders .
    Looked like the back'd sagged & extended forks . Mustve steered badly at speed .

    Maybe check stauchion & bush spacer part numbers . For year same , to compare .

    The LOWERS theres the Original long Pre Unit , UNIT Square face bottom 2 inch shorter .
    The 60 / 62 650 loweres are intermediate, 1 in longer than UNIT ones .
    Longer Lowers allow more travel , or longer bush spacers for better resistance to bow .
    Tho Single down tube fork axle location isnt as durable / secuure . perhaps .
    Definately so on a ' slip thru ' axle one .

    Think a lot of the F -750 stuff was High Tensile . Look at a Drum Brake - Oldani - Works Trident fork assembly for inspiration .


    Assume these are BSA / Roadholder diameter High Tensile STAUCHIONS .[​IMG]

    The F 750 Triples ran the Steel Lowers with the Disc Caliper Brackets welded on .

    Bit like a Cortina ! any part'll fit . with a big enough hammer .:p Tho some finnesse is to be preferred .
    nortriubuell likes this.
  6. lazyeye6

    lazyeye6 VIP MEMBER

    Feb 28, 2014
    The front axle is shorter on a 500 than a 650. That would mean that the triple trees are different as well.
    68-70 TLS brakes are smaller on a 500.
    nortriubuell likes this.

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