Fitting A 19 Tooth Sprocket To My T100 Bonneville

Discussion in 'Bonneville' started by DGBland, Jun 26, 2018.

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  1. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #1 DGBland, Jun 26, 2018
    I would like to fit a 19 tooth sprocket to my T100 Bonneville but the chain is relatively new with no wear. Will I be able to fit the new sprocket without changing the chain and moving the wheel forward on the chain adjusters? Or would i need to change the chain to one with an extra link or two?

    D Bland
     
  2. steve lovatt

    steve lovatt Something else

    May 12, 2014
    9,218
    1,000
    North Yorkshire
    #2 steve lovatt, Jun 26, 2018
    I've done this on a 2004 790cc T100 and a 2012 865 SE. You will need to slacken off the back wheel and the adjusters in order to give the chain more slack for the larger sprocket to fit. Simple enough job and then set the correct adjustment on the chain making sure the rear wheel is aligned and then finish by tightening the two adjusters up to 5Nm otherwise they will work loose. I think the rear wheel spindle nut is 85Nm.
     
  3. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #3 DGBland, Jun 26, 2018
    Thanks I will order one straight away
     
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  4. Andreas_CH

    Andreas_CH Member

    Apr 11, 2018
    26
    13
    Switzerland, Rapperswil
    #4 Andreas_CH, Jun 26, 2018
    May I ask out of curiosity why one would want to do this? Not a trick question; I have really no idea about any technical details.

    Andreas
     
  5. Rocker

    Rocker Elite Member

    May 1, 2016
    1,662
    800
    Suffolk
    #5 Rocker, Jun 26, 2018
    With this mod it's like having a sixth gear :) (not so revy)
     
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  6. crispey

    crispey crispey creme de la creme

    Nov 6, 2014
    7,229
    1,000
    Uk
    #6 crispey, Jun 26, 2018
    This will show you the benefits
     
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  7. H.O.

    H.O. Noble Member

    Nov 28, 2015
    1,045
    300
    ARDROSSAN, AYRSHIRE
    #7 H.O., Jun 26, 2018
    Well worth the time exchanging it, so more of a relaxed ride with the lower revs.
    How-ever, if you are wanting to climb Swiss mountains you could go the other way and fit a 17t sprocket, you will be able to go straight up the north face of the Eiger without stopping!:grinning:
     
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  8. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #8 DGBland, Jun 26, 2018
    I have now ordered a 19 tooth sprocket and am looking forward to fitting it. However I have just been told the thread on the sprocket nut may be a left handed thread (anti clockwise to tighten and clockwise to loosen) Is this right. It's not a problem but It will be easier if I start doing it the right way
     
  9. Mad Cow

    Mad Cow Member

    Jul 2, 2018
    38
    13
    Central Iowa, USA
    #9 Mad Cow, Jul 2, 2018
    I thought about doing this to my 2017 T100, but 1st is a moderately tall ratio in mine and I have to deal with some interesting non hard surface roads frequently that I don't think it would be such a great idea.
     
  10. Andreas_CH

    Andreas_CH Member

    Apr 11, 2018
    26
    13
    Switzerland, Rapperswil
    #10 Andreas_CH, Jul 2, 2018
    Thanks for the explications. Wasn't too hard to understand even for me :grinning:
     
  11. Kris Koppy

    Kris Koppy New Member

    Jun 3, 2018
    0
    1
    Kansas City, Missouri, United States
    #11 Kris Koppy, Jul 2, 2018
    Could you tell me where you ordered your sprocket from? I can’t find a supplier.
     
  12. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #12 DGBland, Jul 5, 2018
    I ordered mine on E Bay from a company called Squaredeals UK limited, 21 Middlewood, Ashurst, Skelmersdale, Lancashire, WN8 6SR - United Kingdom. The website is www.triumph-online.co.uk
    The total cost was £14.99 GBP only.
    I haven't had a chance to fit it yet as I have been away for a week but if you want I will update you as soon as i fit it and let you know how I get on. It does look good quality.
    There is another good local company near me called TEC motorcycle parts in Newcastle upon Tyne England and they have a website. The only reason I didn't get one from these as they didn't have any in stock at the time. This is another good company who specialises in Triumph parts
    David
     
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  13. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #13 DGBland, Jul 6, 2018
    Well I have now fitted the 19Toot sprocket and to be honest I am a little dissapointed. I was led to believe it would take the engine revs down by about 500 revs a minute in all gears. However the difference is not very noticeable if anything it may have taken the revs down about 200 at the most. I can see it making a difference if you go from 17 to 19 but 18 to 19 is not worth it..
    I will have to take the sprocket cover off and count the teeth because I am not convinced it's right. It is bigger than the 18Tooth sprocket so I can only assume this one has 19 teeth. On the plus side the old sprocket was quite worn after 20 thousand miles so it needing replacing anyway.
    David
     
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  14. TriBriBon

    TriBriBon Well-Known Member

    Jun 23, 2017
    152
    93
    UK
    #14 TriBriBon, Jul 6, 2018
    Carried this mod out on my T100 and as the boy's say, it's a bit like having overdrive, drops rev's in 5th gear, so more relaxed riding :cool:

    TBB.
     
  15. Johnjo

    Johnjo Senior Member

    May 29, 2017
    548
    243
    Birmingham
    #15 Johnjo, Jul 6, 2018
    I agree completely. I fitted a 19 tooth from an 18 and could hardly tell the difference. Wish I had noted the revs before and after fitting the 19 tooth just to see how little difference there is.
     
  16. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #16 DGBland, Jul 6, 2018
    Yeah the annoying this is though this 'upgrade' is advertised on the websites as being a positive upgrade which will improve the ride and it has made hardly any difference. The only good point is the old 18 tooth sprocket was worn after 20 thousand miles and needed replacing anyway
     
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  17. capt

    capt Elite Member

    May 8, 2016
    3,051
    750
    western Australia
    #17 capt, Jul 7, 2018
    You could do the rear sprocket ! Two or three teeth is equal (roughly) to one on the front, so more fine tuning is possible.... ?
     
  18. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,066
    1,000
    Central France
    #18 thebiglad, Jul 7, 2018
    I changed from 18t to 19t on my 2010 T100 and it made a noticeable difference.

    At 60mph it dropped the revs by about 350, in top gear.
     
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  19. DGBland

    DGBland Member

    May 5, 2016
    35
    18
    Washington Tyne and Wear UK
    #19 DGBland, Jul 8, 2018
    What revs are you now running at, at 60 and 70mph?
     
  20. thebiglad

    thebiglad Old fart, still riding !

    Sep 25, 2013
    5,066
    1,000
    Central France
    #20 thebiglad, Jul 8, 2018
    Hi DG this was done on a Bonny I had until 2016. I can't remember offhand what the revs at particular speeds were - all I remember was the effect of the change of sprocket.
     
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