Francis-Barnett Owners Club Forum

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Joining the Francis-Barnett Owners Club could not be easier. Goto the club's website www.Francis-Barnett.co.uk
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For those that would like to join in the traditional way again goto www.Francis-Barnett.co.uk and scroll down to middle page paragraph titled "Join the Club" just click on the learn more link further below and print off the application form. All information is contained in the form with address and membership fees.
Come and join one of the most friendly classic bike clubs around and help to keep the Francis-Barnett name alive.

Francis-Barnett Owners Club Forum

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Francis-Barnett Owners Club Forum

The Forum of the Francis-Barnett Owners Club. Keeping Alive a Living Legend.

Latest topics

» 1930 Super sport model 9 lubrication
Oils and tyres  EmptyWed May 27, 2020 9:22 pm by piston 197

»  1938 Cruiser 39 for sale
Oils and tyres  EmptySun May 24, 2020 1:56 pm by kerabo

» Parts for 1935 E39 Cruiser
Oils and tyres  EmptyTue May 05, 2020 11:10 am by Andy Briggs

» 1932 falcon .... I think !
Oils and tyres  EmptyMon Apr 27, 2020 12:39 pm by Mattwhite

» Oils and tyres
Oils and tyres  EmptyFri Apr 10, 2020 8:34 pm by piston 197

» Cruiser 39 - Points cover, etc
Oils and tyres  EmptySat Apr 04, 2020 7:43 pm by Andy Briggs

» powerbike 50
Oils and tyres  EmptyThu Mar 19, 2020 3:07 pm by dennis payne

» Falcon 74 - Headstock Section of Frame Required
Oils and tyres  EmptyTue Feb 04, 2020 12:27 pm by John Wakefield

» Model 95 / Amc150 - real head scratcher
Oils and tyres  EmptyThu Nov 21, 2019 10:31 pm by keith livingstone


    Oils and tyres

    kerabo
    kerabo

    Posts : 2872
    Join date : 2008-02-11
    Age : 70
    Location : Spalding Lincs. Cruiser 39. Falcon 87. Green Lane Bitsa. Sunbeam S8

    Oils and tyres  Empty Oils and tyres

    Post  kerabo on Sun Sep 01, 2019 4:04 pm

    I have been out and done about 25 trouble free miles on my Cruiser 39 today. I have the smoke about correct but not at 2.5 turns as suggested, mine is 1 turn out. I am guessing it's because I have Castrol XL 30 and Not 40 as I could not find any.
    So my question is what do others use?

    Also what are the tyre pressures as I can't find anything in the handbook.

    Thanks Ken
    avatar
    JackE

    Posts : 21
    Join date : 2020-04-01
    Age : 73
    Location : Buxton, Derbyshire

    Oils and tyres  Empty Re. tyre pressures

    Post  JackE on Fri Apr 10, 2020 7:42 pm

    I'm glad I came across your post, Ken, as it started me digging (what else to do whilst we're in the slammer?) and I came up with some info on the BSA A7 / A10 net which gave me a bit of a jolt (links below).
    I have a book of data for BSA models, which BSA published in 1955.  Tyres used on the A.10 Golden Flash were 3.25x19 front, and 3.50x19 rear - and Speedmasters on front and Safety Mileage on the back would have been typical fitments.
    But this is how the tyre pressure recommandations have changed over the years . . .
    From BSA, 1955 - Front, 17psi; Rear, 19psi.
    From Haynes Manual (maybe 1980s?) - Front, 18psi; Rear, 20psi.

    From Lightning Spares in 2009 - Front, 28psi, Rear 30psi solo, 32psi, two up!

    Brian, of Lightning Spares, told the OP on the BSA forum that he'd lost count of the number of soft tyres he's seen at BSA meets only to be told by proud owner they are running at BSA handbook stated pressures.

    The problem arises because the 'cling' rubber which came in around 1963 - and which has been dramatically improved since then - is much softer than pre-cling rubber, which means if you run at the original recommended pressures, the side walls flex far too much, and - as the OP on the A7/A10 net found - you can rip the valve right out of the tube due to the tyre slipping on the rim!  Luckily, he was only doing about 30mph at the time, so he got no more than a nasty fright.

    I think your best bet is to contact a tyre specialist, tell him what tyre size you're using, the weight of the bike, and the sort of load it will be carrying.  Arthur Gent's book quotes a dry weight of 280lb for a Cruiser 39, so you should be able to check the weight, one wheel at a time, on a set of bathroom scales.

    HTH, and best regards,
    Jack

    https://www.a7a10.net/forum/index.php?topic=11371.0

    https://www.a7a10.net/forum/index.php?topic=1538.0
    piston 197
    piston 197
    Moderator

    Posts : 4791
    Join date : 2008-08-17
    Location : ross-on-wye

    Oils and tyres  Empty Tyre pressures

    Post  piston 197 on Fri Apr 10, 2020 8:34 pm

    Ken as said above there are varying recommendations based on combined weight of machine and rider/pillion and the type of tyre ?
    Avon recommend tyre prssures for classic bikes on 3.25 x 19 tyres of
    Front 25-28Lbs
    Rear 28-34Lbs

    as a solo rider on a fairly lightweight machine i would err towards the lower of those limits.
    I am glad you are enjoying the Cruiser, makes me think maybe i should have kept it ? although my model 14 is a treat to ride, but not used often enough .

    JH

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    Oils and tyres  Empty Re: Oils and tyres

    Post  Sponsored content


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