Weird Reversed Stem Geo / Chat

[Plummet]

Generally I would agree that if your bike is already with a traditional stem on the small side for you, then adding an RR stem is not going to be as beneficial. Individual preferences play a roll too, so sometimes the super playful slalom bike type feel you can get with the RR stem on something a bit small for you can be really fun, but generally I would say bias towards a bike that feels perfect to a bit big when setup traditional for a good feel when switching to RR. How tall are you?

5'11.

What i could do is just do flip my stem around on my dh bike tripple clamp. That would give -40mm test.
Still i would want a longer bike. that bike is 465 reach. I'd want to push the reach longer to counteract the reduced cockpit.

 

[Nobrks]

467 CS / 502 Reach / 173cm / RAD 836 at 63,4deg
23cm steeret tube,
-50 stem
+70 rise
Grips 30-40mm behind center

 

[irie]

467 CS / 502 Reach / 173cm / RAD 836 at 63,4deg
23cm steeret tube,
-50 stem
+70 rise
Grips 30-40mm behind center
View attachment 179589

"Grips 30-40mm behind center"

"behind center" of steerer tube, front axle, or what?

 

[Weeksy]

"Grips 30-40mm behind center"

"behind center" of steerer tube, front axle, or what?

steerer looking at picture.

 

[James_MTB]

I've ordered an Aerozine stem to try out.

 

[irie]

steerer looking at picture.

Interesting.

Just looked at my bike (2022 alloy Rail) with Lyrik D1 (44mm offset) uncut steerer tube (about 140mm?) and PNW Loam Carbon bars (cut to 780mm) which have 10 degree backsweep and the centre of grips are a few mm behind the steerer centre. Stem is Spank Split 38mm.

 

[DylanJM]

I swear some of you are trying to build the ugliest bikes possible. My god!

 

[Zimmerframe]

I swear some of you are trying to build the ugliest bikes possible. My god!

That's not fair. Haibike started the trend, Spesh took up the challenge knocking it out of the park, people are just following the current fad !

 

[Nobrks]

I swear some of you are trying to build the ugliest bikes possible. My god!

Well, don't want to spend 8k on a test mule, use what I have and buy the cheapest parts needed to get the geometry right and get going 850Euro used so far.
But it is quiet to look down at a -50 stem Reversed arc fork and reverse stem are a bit mind cracking.

...it does not even have a battery

 

[TonTonUB]

I've ordered an Aerozine stem to try out.

I'm really curious to read how the stem handles harshest rides ? I'd like to test one, but it looks to tiny ...

 

[James_MTB]

I'm really curious to read how the stem handles harshest rides ? I'd like to test one, but it looks to tiny ...

I'm waiting for the 35mm version to be released.

Article on theradavist.com A List of Reduced-Offset and Zero-Offset Stems

 

[irie]

I swear some of you are trying to build the ugliest bikes possible. My god!

If ugly works really well it then becomes beautiful and the desirable norm.

 

[DirkWisely]

Any updates on when the current batch is going out?

 

[irie]

Seems to me that the biggest problem is created by manufacturers cutting steerers very short for show room appeal. With an uncut steerer the fore/aft position of bars can easily be adjusted by changes to stem length/orientation and bar sweep.

 

[CarolinaCrawler]

One thing about uncut steering tubes is the leverage. I know Rockshox does not recommend more than 30mm of spacers under the stem due to leverage.

 

[irie]

One thing about uncut steering tubes is the leverage. I know Rockshox does not recommend more than 30mm of spacers under the stem due to leverage.

What leverage is affected by spacers?

Edit: Do you have a link to where Rockshox explicitly recommends not exceeding 30mm stem spacers?

 

[Suns_PSD]

It's true that ideally you want the most direct/ short connection between your fork and your bars. Flex is introduced the longer the steerer tube is and the higher the bars get. And I guess the stem gets in this case.

 

[Plummet]

467 CS / 502 Reach / 173cm / RAD 836 at 63,4deg
23cm steeret tube,
-50 stem
+70 rise
Grips 30-40mm behind center
View attachment 179589

That is such a franken bike.
Is it 500 reach and you are 70 behind that giving you 430 reach?

 

[irie]

One thing about uncut steering tubes is the leverage. I know Rockshox does not recommend more than 30mm of spacers under the stem due to leverage.

What leverage is affected by spacers?

Do you have a link to where Rockshox explicitly recommends not exceeding 30mm stem spacers?

 

[longpete]

One thing about uncut steering tubes is the leverage. I know Rockshox does not recommend more than 30mm of spacers under the stem due to leverage.

I'm tall. I ride forks wit 4cm of spacers and more since the nineties. Never had a problem. (and I did brake almost anything that can be broken on a bike). But I'm not a downhiller.
Rulezman Suspension He did what it is here about years ago. The longer the chainstays the higher your bar can be. On a tandem (very long) short stem and bar higher than saddle no problem for climbing(if rech is long). Reach and chainstay length are connected.

 

[CarolinaCrawler]

What leverage is affected by spacers?

Edit: Do you have a link to where Rockshox explicitly recommends not exceeding 30mm stem spacers?

Its in the single crown fork installation manual.

 

[irie]

Its in the single crown fork installation manual.

Yes, I see it, thanks.

No more than 30 mm of spacers should be installed below the stem.

Must admit to never having read that installation guide. In any case cannot see any information why the 30mm warning exists nor whether it applies to all steerers of all materials.

If steerer flex is the concern then it would be (vaguely) interesting to compare steerer flex with frame flex, fork stanchion flex, handlebar flex, stem flex, etc.

 

[Who’s There]

I would speculate that once you have determined your ideal spacer stack to replace that stack with a one piece spacer for the strongest possible headset preload. And maybe if you are really up there a headset through bolt that clamps to the bottom of the fork crown might also help hold things together( a head tube tool kit would be handy dual purpose here)

 

[Rob Rides EMTB]

Its one of the best reasons for Dual Crown on an enduro style ebike. There's a lot of flex with single crown forks in comparison. Now the Podium is only aroung 60g lighter than the Fox 40, and the amount of ebikes that come with the Podium, its so much better IMO to go dual crown instead. I dont even care for the 200mm travel of a dual crown, but the directness and precise steering, and lack of torsional and directional flex are unrivalled.

 

[irie]

I would speculate that once you have determined your ideal spacer stack to replace that stack with a one piece spacer for the strongest possible headset preload. And maybe if you are really up there a headset through bolt that clamps to the bottom of the fork crown might also help hold things together( a head tube tool kit would be handy dual purpose here)

Did occur to me to use a sleeve instead of multiple discrete spacers, but headset preload is low torque.

 

[Who’s There]

Its one of the best reasons for Dual Crown on an enduro style ebike. There's a lot of flex with single crown forks in comparison. Now the Podium is only aroung 60g lighter than the Fox 40, and the amount of ebikes that come with the Podium, its so much better IMO to go dual crown instead. I dont even care for the 200mm travel of a dual crown, but the directness and precise steering, and lack of torsional and directional flex are unrivalled.

I’m a big fan of dual crown, but turning radius is so limited on my present fat down tube bike. Maybe I need to go Avinox on my next bike if they allow more room.

My favorite TRAIL bike back in the day was a Stinky Primo with a Marzocchi SuperT, that fork would smoke a modern fork for feel I’m sure.

 

[Rob Rides EMTB]

I’m a big fan of dual crown, but turning radius is so limited on my present fat down tube bike. Maybe I need to go Avinox on my next bike if they allow more room.

Yes, avinox based bikes probably not far off normal bike. And a Fox 40 give more steering radius than most too.

 

[cozzy]

I’m a big fan of dual crown, but turning radius is so limited on my present fat down tube bike. Maybe I need to go Avinox on my next bike if they allow more room.

My favorite TRAIL bike back in the day was a Stinky Primo with a Marzocchi SuperT, that fork would smoke a modern fork for feel I’m sure.

Its more to do with how much offset is in the crown. The old boxxer with 0 and 10mm was poor. Dunno what the current gen boxxer uses.
A fox40 with 52mm total offset has 18mm in the crown. The steering lock is very good.

 

[Deleted member 37410]

I think the aversion to dual crowns is a bit of a fashion thing (which is strange since dual crowns look much cooler). There is no reason there could not be light dual crown options available, except that people dont seem to want them

I also love everything about them, except for the steering lock. But I actually also like the steering lock in that the handlebar cant spin freely and destroy cables and stuff in a crash. Depends on the crash I guess

Its also a lot of fun to service them I think, dont even have to remove the crowns!

 

[Suns_PSD]

I'm convinced I'd eat crap around tight turns that drop off and the like as I ran out of steering stop.

Would love to test one.

Also, not certain where to get a spacer that would allow me to run my rear brake cable through my headset routing on my incoming Wild below the top crown.