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  1. #1

    Default Riser Bolt Paranoia

    I just put new bars and risers on the Evo FXDL Iím using as a comfortable and reliable daily... and Iíve just discovered the limitations of spongy stock riser bushings.

    Obviously Iíve added a fair bit of leverage with the height (6Ē rise, 8Ē bar) but I can literally twist these without a huge amount of effort.

    Iíve got some solid and polyurethane bushings on the way but itís got me wondering how much leverage is on the bolts. I donít really fancy experiencing a snapped riser bolt at 70mph, is that a valid concern or am I getting worried over nothing?

    Anyone ever sheared a riser bolt while riding?

    Click image for larger version. 

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  2. #2

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    That's why they are half inch bolts.

    Jim

  3. #3
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    Personally I do not use bolts,
    I use 1/2'' Studs, I was taught at engineering college that it is stronger as they are a higher grade & can take more abuse than any bolt out there, I usually use dome nuts at the bottom to keep it all clean,
    & yes, about 30-40 years ago I did snap a riser bolt but I was lucky & was in a parking lot when it broke & was pushing the bike at the time, at speed & i'd be dead. this is the bike in question,... BSA M21 so not even heavy !!
    Attached Thumbnails Attached Thumbnails old for rowan 076.jpg  
    Last edited by tzienlee; 03-06-2020 at 2:49 PM.

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    Quote Originally Posted by TeeJayE View Post
    Obviously I’ve added a fair bit of leverage with the height (6” rise, 8” bar) but I can literally twist these without a huge amount of effort.

    Yep isn't it amazing what leverage will do???????????

    People very seldom take that into consideration when they start swapping bars and risers............

    So what are your plans to fix the problem??????????

  5. #5

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    Quote Originally Posted by Tattooo View Post
    So what are your plans to fix the problem??????????
    Ive bought some solid bushings so will give those a shot.

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    Quote Originally Posted by TeeJayE View Post
    Ive bought some solid bushings so will give those a shot.
    Awesome............

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    Solids work fine. I run them on all my rides. BTW the 2004-up 39mm Sporty trees are solid instead of bushed and a tidy way to go with fewer parts. I wouldn't disturb a clean setup to convert but did my FXR when I rebuilt the front end.

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    Just imagine all those tweaker out there that have run all kinds of shit bolts and gotten away with it. But if you want to ease your mind just get some high grade bolts. I try to use grade 8 bolts for this kind of stuff. And the chances of those braking are rather remote I'd say.

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