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Discussion Starter · #1 ·
I am looking at putting my PBR 130 on either a Lynskey house blend frame or a custom built steel frame- same cost. My question is would it be better to get a taller headtube put on the steel bike to take up some of the extra space in between the bonded clamps, or are the spaces better or lighter? Also, I have noticed the extra space is above the top cup in all the pictures- is it possible to put spacers on the bottom to slacken the HT angle. Not that I would, just curious.

Thanks.
 

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deuxdiesel said:
I am looking at putting my PBR 130 on either a Lynskey house blend frame or a custom built steel frame- same cost. My question is would it be better to get a taller headtube put on the steel bike to take up some of the extra space in between the bonded clamps, or are the spaces better or lighter? Also, I have noticed the extra space is above the top cup in all the pictures- is it possible to put spacers on the bottom to slacken the HT angle. Not that I would, just curious.

Thanks.
I just had a custom frame built that I will be using a Lefty and P321 steerer on. I went with a longer headtube. My goal with a Chris King headset was to eliminate all spacers below the upper Lefty crown as I think it looks cleaner. My frame builder felt the longer head tube would stiffen things up as well. Keep in mind that the standard size, distance between crowns, Lefty is not that large. For example my frame has a 4.150 inch headtube combined with the CK headset and I'll have no spacers under the upper crown. I don't recommend spacing the bottom as it would mess with where the lower race presses on plus I think it would totally screw the handling of your bike.
 

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Discussion Starter · #3 ·
That's what I figured. So if I know the distance between the bonded Lefty clamps, plus the headset stack height, plus whatever extra the 321 takes up, I should be able to figure out the headtube height? I tried to call and talk to Jake but he was out- I understand he's the guru at 321?
 

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Discussion Starter · #5 ·
That's what I figured. So if I know the distance between the bonded Lefty clamps, plus the headset stack height, plus whatever extra the 321 takes up, I should be able to figure out the headtube height? I tried to call and talk to Jake but he was out- I understand he's the guru at 321?
 

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Compulsive Bike Builder
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Bonded lefties now come with two different spacings, 138mm and 163mm. Your frame's headtube + headset must fit between the clamps.

If the headtube + headset is less than the clamp spacing you must use spacers or get a headtube with a taller stack height.

There is no way I know of to add spacers on the bottom of the adapter after considering it with many installations. I have seen some headsets available with taller lower cups, mostly for 29ers. I can't remember which ones, however. That would let you play with the geometry a little.

If I were making a frame from scratch I would get it made so you used no spacers. But you will also always have to use a headset with the same stack height.
 

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deuxdiesel,
Looks like these guys answered all you questions while I was out of town.
Thanks guys!:thumbsup: It's really that easy, headset stack plus head tube have to
be less than the distance between your lefty clamps. Our adapter doesn't take up any
of that space so all you have to worry about are those two numbers.

Jake
Project321
 

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A hopped on pop.
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like the others have said, the standard pbr comes with 138mm of space between the clamps, the "xl" version has about 163mm.

not sure how tall you are, but i am 6"1 with VERY long legs and i run the stardard clamp width pbr (130mm travel) and i have plenty of bar height (i also run a flat bar).

my custom quiring ti ss has a 105mm ht length and a king headset (32mm stack height)...total of 137mm of stack. perfect.

i run the project 321 steerer....Jake makes a great product....support him. i am probably going to order a new p321 28h lefty hub to lace to a edge 29er carbon rim. call ya soon Jake!!!

also, i'd suggest cutting the crown race of you headset so you can seat it by hand. it makes things much easier. and, i'd also suggest a cane creek headset or another brand that has a compression ring. my king headset gets loose after every ride. i had to add a azonic headlock, and that keeps things tight.

crown to axle for a pbr 130 is 500mm unsagged. the 140mm pbr should be 510mm unsagged.

the pbr is a great fork. i only have a couple of rides on mine and i already like it more than the 2010 fox f29 rlc fit i was running.

here is a crappy pic of my set up;
<img src=https://farm3.static.flickr.com/2769/4266117505_056d68f572_b.jpg>
 

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Discussion Starter · #11 ·
I spoke to you today about it Jake- thanks for the information! I will get my frame builder on the case now. Looking forward to getting this done.

David
 
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