tallest front tyre and lowest rear

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  • tallest front tyre and lowest rear
  • campfreddie
    Member

    i need to slacken the headtube angle of my ftm carbon. i can’t fit an angleset and am stuck with the forks i have (fox 140’s rather than rs 150’s which would have been much better). i am looking towards offset bushings, but need to check clearance on the seat tube.

    the other avenue to look at is my current choice of tyres. i am running 2.25″ nobby nics front and rear.

    on my yeti asr5 i ran rocket ron / racing ralphs with great success. i am therefore inclined to go with a 2.1″ or 2.25″ racing ralph on the back to give me a much lower tyre (which will help with frame clearance if i go down the offset bushing route). is there anything worthwhile that is lower?

    it needs to be suited to trail centre usage, very light and able to be set up tubeless.

    in the same vein, i want to go large on the front, but again as light as possible and able to set up tubeless. hans dampf 2.35″ perhaps?

    fozzybear
    Member

    Just be aware that RS are 5mm longer A2C than fox.
    if you did get a 150 RS fork that would be 5mm longer A2C than a 150 Fox float.

    i’m asking out of interest not a smarmy question.
    Why can’t you fit a 150 fox?

    Premier Icon thepurist
    Subscriber

    Bonty XR4s are quite tall – tall enough to foul the seat tube of the FTMc under full compression anyway.

    dantsw13
    Member

    I don’t think offset bushings will work on a FTMc – the clearance between the shock and the mounting is very tight. Mine had to be replaced as the shlock was actually touching the mount under the top tube.

    Why no angleset? What head tube does it have?

    Why no angleset? What head tube does it have?

    bigyinn
    Member

    Surely the amount you’ll gain fannying around with tyres will be negligible?
    Why not just pump up the front as hard as possible and run the rear virtually flat?

    Premier Icon richmtb
    Subscriber

    Works Components do an angleset that will fit 1&1/8″ headtubes.

    Gives a degree of HA

    More effective than messing about with tyres

    More sag on the rear less on the front would be more effective than running different tyres

    campfreddie
    Member

    nobody does an angle set for the ftm as it is a is42/52 headset

    i’ve just been to check the rear tyre clearance and at full compression, a 2.25″ nobby nic just about touches the seat tube, so i guess offset bushings are out.

    Premier Icon scotroutes
    Subscriber

    Is there enough room in the forks to fit a 650b wheel and tyre?

    rob jackson
    Member

    No it won’t. Have you ridden it yet, not steep at all in reality

    cynic-al
    Member

    Playing with tyres will only make a tiny difference.

    You’d need 18mm radius difference to equal 1 degree

    Premier Icon stumpy120
    Subscriber

    Never mind slackening the head angle. Has anyone worked out how to stop the hanger from snapping all the time? Been through 8 in 10 months.

    Premier Icon matt_outandabout
    Subscriber

    Rear go for WTB Vulpine. Front go for AdVantage 2.4.

    rob jackson
    Member

    Stumpy – buy a new hanger with only 2 holes

    dantsw13
    Member

    Rob – where from?

    Premier Icon stumpy120
    Subscriber

    Rob, Are those available?

    Premier Icon mboy
    Subscriber

    Playing with tyres will only make a tiny difference.
    You’d need 18mm radius difference to equal 1 degree

    You’d be surprised just how big and how small some tyres are.

    The old 2.2″ (not the 2.35’s) Bontrager XR4’s I had were a 27″ tyre! And a Fox fork has a lot of clearance for big tyres so it could make enough difference.

    Some of the older Maxxis were quite low profile for their width, 2.35 HR’s for instance. A Hans Dampf up front would be a good idea as they’re massive for their stated size!

    rob jackson
    Member

    Yes betd goldtech do them and brant said he was investigating them. You could also try not using the middle screw?

    rocketman
    Member

    Highest profile tyres I’ve ever used are 2.5 Minions. They might be narrow – more like a 2.2 – but they’re not lacking in terms of height they have tall sidewalls. 60a folder not too heavy 800g or so

    Lowest profile has to be Rocket Ron. The 2.25 is a good 10mm lower than the same size Nobby Nic. Very light

    campfreddie
    Member

    right… i’m pretty much decided on what to do.

    changes as follows

    i will be changing the fork to a new 2014 RS Revelation RCT3 dual position (150mm). This should give anything up to 1.5 degrees over the 140mm Talas (on account of the increased travel and naturally longer a-c of a RS fork).

    i will also be changing my tyres to a 2.35″ Hans Dampf Trailstar front and a Racing Ralph 2.25″ Snakeskin Pacestar rear. This should give me just under 1 degree.

    I will put in one Burgtec offset bushing which should give me half a degree.

    Lastly, I will change my upper headset from the 15mm FSA to a 8mm Cane Creek to bring the stem down a little.

    By my ill-informed calculations, I should end up with broadly a 66-66.5 degree headtube angle (similar to a Yeti SB66) with not much difference in the BB height (the fork will bring it up and the offset bushing and shorter rear tyre will bring it back down).

    How does that sound?…. just need to flog the Fox fork and the Nobby Nics now. Cost to change should be just under £250 all in (Bike24 have a very good deal on the new Revs).

    As for the new mech hanger, I bought one of these with my frame from On One a month or so back.

    DiscJockey
    Member

    Are you sure, having spent all that time and money, that the bike will actually feel any better ? What improvement are you expecting to achieve from a 1.5° slacker head angle ?

    rob jackson
    Member

    i think that you are pissing in the wind if you think that all of those tweeks will give you a 66 degree angle.

    ChunkyMTB
    Member

    New frame?..

    dantsw13
    Member

    As I posted above, are you sure offset bushings are suitable for the FTMc? The clearance at both ends of the shock is minimal, so moving the shock body further into the mount (which is what an offset bushing will do) may be problematic. I’ll go outside and measure now.

    campfreddie
    Member

    i like tweaking things as i don’t get enough time to ride. it makes me happy, so yes, it is worth it.

    as for the offset bushing thing… i am going to swap the shock around and place the single offset bushing in the shaft end which will then be fitted at the top end (headtube end) of the frame. this should prevent the issues with clearance of the air valve with the toptube shock mount. the frame hardware is 8mm, so i’m only going to get half a degree with one, but it all helps.

    changing the tyres will also be worth it. the hans dampf in trailstar guise should perform much better than the nobby nic in pacestar guise and the racing ralph pacestar out back will also roll quicker. both tyres will be snakeskin which should give me better sidewall protection than the current nobby nics which aren’t.

    the headset bearing change is essential as the size large ftm frame has a really long headtube and shoving a 15mm top cap on there isn’t helping matters.

    that just leaves the fork… i like rockshox and the new revelation looks spot on.

    as for why i don’t go for a new frame… the ftm carbon builds up really light (i am sub 26lbs as it stands now complete with reverb and trail wheels)and spritely. i paid £500 for the frame (via on one’s ebay site), so to get close, i would need to spend a chunk more cash.

    provided i decide to stick with 26ers for the time being, i don’t see it as a stupid waste of money (the entire build will stand me in at less than £2,200).

    dantsw13
    Member

    Freddie – Ive just had a quick look for you. My Frame was warranty replaced by O-O due to the Air valve on the Monarch striking the shock mount, and they sent me the new frame with the shock reversed as you describe. You won’t be able to put a bushing that end, as the shaft still only has 1mm clearance from the mount. However, you should then be able to put 1 bushing at the aircan end, once it is reversed. HTH.

    Premier Icon scotroutes
    Subscriber

    If you are buying new forks anyway, just go for a 650B front wheel too.

Viewing 29 posts - 1 through 29 (of 29 total)

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