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Discussion Starter #1
I read through a bunch of old posts to find out that it is possible to fit TBS risers to a Thunderbird. My question is what size and length bolts are needed to accomplish this? I have a 2001 Thunderbird with Speed Triple bars mounted to the stock T-bird risers. I'm trying to get a little more height and just a smidgen more pullback. I just acquired a set of TBS bars and risers but the mounting bolts were not included. Can somebody help me out with this one? Thanks in advance.
 

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they are 8mm diameter. oops they are 10mm diameter

The length will probably be different than for a TBS.

The triple trees are different.

The early Tbird has rubber shock absorbing bushings.
The TBS does not have those.
I don't know about the later Tbird.

The bushings add to the length of the required bolt.
You can't just leave the bushings out cause the Triple Trees are made specifically to hold those.

Hope that helps a little.
 

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Actually the bolts are M10 by 95mm, but they are somewhat special in that they have M10 fine/medium threads (1.25mm) & 14mm across flats hex. The locking nuts are also 14mm spanner size.

The hex head at the top, inside the riser, does need to be 14mm as it locates in a matching recess to prevent the head turning when tightening.

Also, when I fitted them to my Tbird yoke, I found I needed to add a washer at the yoke, as the TBS risers are an oval shape & don't quite fit in the circular riser recesses on the Tbird top yoke.

The stock TBS bolts also have a drill hole for fitting an 'R' clip. These Triumph parts are long enough to add the washer at the top if the clip is ommitted. Which is fine imo, as the stock nuts are steel locking type, not nylon.

M8 bolts, say 100mm & trimmed a little, if required, could be used but std. hex is 13mm (I think?). You would want to check if 13mm would still be captive in the riser. This is a useful feature because when fitting it enables the bars to be fitted & tightened in proper alignment before tightening the riser nuts.

I'm using M8 high tensile bolts with TBS risers on my Kawa top yoke, with nylock nuts, which I'm happy are strong enough (& I use high bars) but in your situation I'd probably buy the Triumph bolts & matching nuts for ease of fitting.

I have these TBS bolts & nuts, but one of the bolts is slightly bent, otherwise I'd offer them to you. (Didn't notice when I originally fitted them!)
 

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Discussion Starter #4
Thanks Mike. Now all I have to do is find a place to buy the bolts from. I assume that the nuts and R clips on my present T-bird risers will fit the longer TBS bolts?
 

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Probably right about that tho' I'm not sure there'll be enough thread left to fit the clips after a washer's been added on top of the yoke. Hardly needs the clips as well as locking nuts I think?
 
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