Open Discussion Group

TSR2 Belt drive – remove of rear wheel

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  • #2348
    Angus Fletcher
    Participant

    Can anyone let me know the proper procedure for removing / replacing the rear wheel of a TSR2 Belt drive. There is nothing in the manual about it and I want to know what I am doing when faced with a puncture.

    Any thoughts or links would be much appreciated.
    Many thanks

    #3361
    MCS Eacock
    Member

    Removing the back wheel is no problem. Just loosen the coaster brake bolt, loosen the axle nuts, slide the wheel forward a bit to relax the belt. Push the blet off the front cog and pull the wheel out of the frame. Voila – no greasy hands!!
    I suggest getting a pair of axle-tuggers used on BMX bicycles to snug up the chain. The stock tugger on the TSR-2 is too delicate.
    Upon replacement, the belt should be taut, but not so tight as to cause drag on the bearings. Hope this helps.

    #3362
    Ian
    Participant

    What is an axle-tugger?

    #3363
    Gavin Clark
    Participant

    Ian, ‘axle-tuggers’, or chain tugs as they’re more commonly known, are little gizmo’s to simplify tightening the chain (or belt in the case of the TSR 2) on bikes that don’t have derailleurs to tension the chain. I believe they only work on bikes with rear facing dropouts though since they are mounted on the rear axle and the end of the dropout.

    I’ve not found the chain tugs that come as standard on the TSR 2 to be delicate – IMO they do the job just fine.

    With regard to removing the back wheel of a TSR 2, there’s a good description (with pictures) at http://www.bikeforums.net/showthread.php/711924-250-miles-with-the-new-Belt-Drive-Moulton-TSR-2?p=12285968&viewfull=1#post12285968.

    When replacing the wheel, you need to ensure the belt is tensioned so that there’s no more than about 10mm of deflection at the centre of the belt.

    #3364
    Pandora
    Participant

    In the case of the belt and deflection of 10mm, can there be a tight spot due to uneven stretching and wear, which you can have with a chain?

    #3365
    Peter Ludwig
    Member

    Gavin wrote:
    > ‘axle-tuggers’, or chain tugs as they’re more commonly known, are little gizmo’s to simplify tightening the chain (or belt in the case of the TSR 2)

    The mentioned device (if it is the snubber) on a TSR2 is NOT there for tensioning the belt. It’s task is keeping the belt from jumping at the rear cog. There is no need that the snubber touches the belt at all (most of the time).

    Pandora: ‘tight spot’ means that the tension depends on crank position?

    #3366
    Gavin Clark
    Participant

    Thanks Peter, but I wasn’t talking about the snubber. As well as the snubber, there is a chain tug fitted to each side of the rear axle in order to get correct belt tension. You can see it in this picture – http://www.flickr.com/photos/45051578@N05/5578768339/in/set-72157626152828970 – it’s the thing behind the snubber attached to the axle and the rear of the dropout.

    #3367
    Pandora
    Participant

    tight spot, – not really related to crank position, thinking of chain drives, especially motorbikes, the motorbike stretches and wears the chain in an uneven manner, in certain positions it may be tight ie very little play, rotate the wheel and it may then be very slack, it was always important to find the position of tight position and set chain slack to that point, get it wrong and the bearings in gearbox and wheels suffer overloading and short life.

    Do the the rubber belts exhibit the tight/slack phenomenon? That is my question.

    #3368
    Gavin Clark
    Participant

    Pandora – yes you can feel the belt on TSR2 is tighter at some places on a crank revolution than on others. Though I believe it’s not to do with whether you have a belt or chain drive, but because the chainrings and sprockets are never 100% round.

    I guess setting teh belt tension so there’s some deflection (rather than as tight as possible) is to take any irregularity into account.

    Gavin

    #3369
    Pandora
    Participant

    I now have a TSR2, new and so far ridden 10 miles from shop to home.

    Dealer has lost the handbook which I assume will have maintenance information
    Pashley will not send one out ( only to dealers as an theft disincentive) so it could be some time before have one to read.

    The belt deflection is around 5 to 6 mm mid-point of top run of belt.

    Is 5 to 6 mm of deflection within specification?
    Do I need to loosen the belt to about 10mm?
    Any numbers in the handbook for belt tension.

    #3370
    Angus Fletcher
    Participant

    A very belated thank you for all your info 🙂

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