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Head Stem on this 'off set' frame? (pic)




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Old 05-10-2017, 07:10 PM   #1
FireChief
 
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Head Stem on this 'off set' frame? (pic)

I've studied some material at this site and others regarding stem length and angle. Check out this picture of my Planet-X Evil Eyes frame/forks.

(I just dusted off this bike after it sitting 10 years in the barn)

I am 6'2" and figured I would try a bit longer stem than the current 90mm.

I won't be doing much big stuff, big leaps, etc.. I'm 55, in shape, but don't have a high vertical leap any more. I do enjoy hopping around on the rear wheel and getting up and over on rocks and logs... I'm a little rusty right now but I see myself learning/getting back to small drops while on the rear tire.. getting up and over stuff a couple feet tall or less... SO, ..

Not sure where I will start with the stem spec, but I was wondering if those offset forks should be considered here... Do they, in effect, 'make' the stem shorter because they are out in front of the head tube?

Thoughts?

Oh, I thought I would add -- I won't be doing any 'street' stuff' -- I live in the country - all rocks and logs.. (see pic)


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File Type: jpg trials-playground.jpg (155.3 KB, 29 views)

Last edited by FireChief; 05-10-2017 at 07:21 PM.
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Old 05-10-2017, 10:58 PM   #2
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Nice old school rig!
Must feel quite similar to the moto

The fork offset is because you need a offset from the line of the steerer tube and the hub axle. Most fork have an angle from steerer tube to fork leg or are curved leg. Usual offset ranges from 25 to 45mm
Your fork has parallel legs to the steerer tube, hence the offset at the lower crown race.

Talking stem, you'll have a hard time finding some 25,4mm stems. ( your bars are 25,4mm the old standard. Now all bars are 31.8 )
I think something like a 120X20 would feel good, but you'd then need to swap bars as well.

You might find some used stems that would suit your old school bars!


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Old 05-11-2017, 06:46 AM   #3
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"Most forks have an angle from steerer tube to fork leg or are curved leg.."

Ahhhhhh.... Yes, I see that curve in most all other forks. Totally missed that ...

Thanks a bunch for this great information. I'll give it some thought... I may just "ride on" as I'm enjoying the bike as is right now.. And I'll keep an eye out for an older stem that matches the bar diameter of my old bars.

Incidentally, I purchased this bike from a gentleman in Canada.

Thanks again!
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Old 05-11-2017, 09:09 AM   #4
Tonan
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Chief I'll poke around my garage if I have something close you can have it. Looks like a great riding spot where is the pic from with the moto.
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Old 05-11-2017, 04:53 PM   #5
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Thanks!

Quote:
Originally Posted by Tonan View Post
Chief I'll poke around my garage if I have something close you can have it. Looks like a great riding spot where is the pic from with the moto.
Tonan, Thank you.

The picture is in Central Texas, rural area outside of Austin (my property). The rocks I had "trucked in." These are the small ones. :-) I have another riding area about 100 yards from this one with much bigger boulders.

This small riding area in the picture is only about 30 yards from the house, tucked in some trees. Super easy and quick access.

(The motorcycle is a Gas Gas TXT Pro 300).
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Old 05-13-2017, 08:44 AM   #6
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Rotated bars forward

I rotated the bars forward a bit...

I like the feel.

I didn't get any more height from the rotation but it did increase the distance. I noticed the 'new feel' right away.. Felt like 'more room' - more comfortable...

I will be looking for a longer stem now.. with a bit steeper rise.. see what that does..
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Old 05-13-2017, 03:48 PM   #7
Tonan
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Chief I have a stem for old school bar diameter 120mm about 20 degree rise you can have it! PM me your address and I'll put in in Mondays mail. You can hand me a cold beet at NATS in NC!
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Old 05-13-2017, 10:00 PM   #8
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Quote:
Originally Posted by Tonan View Post
Chief I have a stem for old school bar diameter 120mm about 20 degree rise you can have it! PM me your address and I'll put in in Mondays mail. You can hand me a cold beet at NATS in NC!
You ARE da' man!!

Will send a PM.
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Old 05-19-2017, 09:51 AM   #9
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Quote:
Originally Posted by Tonan View Post
Chief I have a stem for old school bar diameter 120mm about 20 degree rise you can have it! PM me your address and I'll put in in Mondays mail. You can hand me a cold beet at NATS in NC!
Tonan, I got the stem! It's on and I LIKE IT. For me, it feels more comfortable; the position "in the seat" is a bit more like the Gas Gas Pro I ride; which is what I prefer.

I've ridden it two "sessions" with the new stem; it's easier for me to get up and hop on the rear wheel, and I'm progressing faster on my wheelie practice. Not sure if that is the 'geometry' or just that my body is better positioned for coordination and control. Either way its' 'good' --

I provide a few pictures of my fun 'old school' rig.

(The picture makes the stem look longer than it 'looks' in person).

I still have some improvements to make; a new chain, new front brake pads, and a new back brake booster to start... I'm enjoying tinkering with, and 'restoring' this bike. I should have taken a before picture when I dragged it out of the hay barn! It sat in there for 12 years!

Thanks for the stem Tonan. You made my day!


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