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All about Frame and Suspensions Discuss tech help/info for: Hardtail and Full Suspension Frame
Fork, Shocks, Saddle Shocks.

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  #1  
Old 09-13-2009, 02:29 PM
cathya cathya is offline
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Default rigid forks

Some quick newbie questions on forks...

1) Do all forks with the same amount of travel have the same length? What I mean is, are there standard lengths for forks with 80, 100, 120 etc mm travel?

The reason I'm asking is because I want to change my 80mm fork without affecting the geometry so much. As much as possible, I don't want to raise the bars too high or have to change the stem (which i think is already as low as it can go with no spacers).

2) Do rigid forks also come in standard lengths that would correspond to the different lengths of suspension forks. If so, what would these measurements be?

3) Will switching to a rigid fork (or to a suspension fork with a different weight) significantly change the weight distribution of the bike such that bike handling will also be significantly affected?
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  #2  
Old 09-13-2009, 03:18 PM
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Default Re: fork lengths and amt of travel, rigid forks

It's called "axle to crown length". Measured from the axle to the crown. It dictates the resulting geometry of the bike.


Usually, forks with the same travel have roughly the same axle to crown lengths.
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  #3  
Old 09-13-2009, 06:00 PM
cathya cathya is offline
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Default Re: fork lengths and amt of travel, rigid forks

Thanks for the quick reply, pjax. I googled the term you used and found a site with a "Complete Axle to Crown Lengths Library" that was quite helpful.

thanks again
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  #4  
Old 08-24-2011, 10:24 AM
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Default Frame Geometry relative to Rigid Fork

I've been considering to replace my white Epicon LOD 100mm travel with a white rigid fork Mosso. But from what I've been reading on the net, it seems that converting to rigid fork will lower down the front side of my frame.

My concern is it will defeat the geometry of my 2010 Giant XTC FR, thus, may cause unnecessary stress to the frame and of course to myself.

Is there an equivalent size of Mosso fork with 100mm travel suspension fork?

Btw, my setup is XC and been riding now pure hardpack rides.

Any inputs?
  #5  
Old 09-21-2011, 03:40 PM
titaniumgearsolid titaniumgearsolid is offline
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Default Re: Frame Geometry relative to Rigid Fork

Quote:
Originally Posted by ravv View Post
I've been considering to replace my white Epicon LOD 100mm travel with a white rigid fork Mosso. But from what I've been reading on the net, it seems that converting to rigid fork will lower down the front side of my frame.

My concern is it will defeat the geometry of my 2010 Giant XTC FR, thus, may cause unnecessary stress to the frame and of course to myself.

Is there an equivalent size of Mosso fork with 100mm travel suspension fork?

Btw, my setup is XC and been riding now pure hardpack rides.

Any inputs?
You need to find a rigid fork that has a suspension-corrected length. So you should be looking at rigid forks with around 460mm-480mm axle-to-crown length to simulate the length of 100mm travel forks.
  #6  
Old 09-21-2011, 08:04 PM
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Default Re: Frame Geometry relative to Rigid Fork

OT question po, meron po bang 'full rigid' specific frame?
hindi po ba compatible mag full rigid ang hardtail frame?
just asking po.

BTW, common naman ngayon yung GIANT XTC + MOSSO tripple butted Alum. fork....
ako naman previous set up ko, KINESIS KM310 + MOSSO tripple butted Alum. fork....
laki ng deperensya nya from set up ko na epicon 100mm travel... mas mababa ang BB...

----- edit ----
oops, yun po bang GIANT XTC FR ay specifically for FREERIDE application?
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  #7  
Old 09-26-2011, 10:43 AM
titaniumgearsolid titaniumgearsolid is offline
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Default Re: Frame Geometry relative to Rigid Fork

Quote:
Originally Posted by johnbonalos View Post
OT question po, meron po bang 'full rigid' specific frame?
hindi po ba compatible mag full rigid ang hardtail frame?
just asking po.

BTW, common naman ngayon yung GIANT XTC + MOSSO tripple butted Alum. fork....
ako naman previous set up ko, KINESIS KM310 + MOSSO tripple butted Alum. fork....
laki ng deperensya nya from set up ko na epicon 100mm travel... mas mababa ang BB...

----- edit ----
oops, yun po bang GIANT XTC FR ay specifically for FREERIDE application?
image
First off, there's no such thing as "full rigid", just rigid. Meaning no suspension except for the tires, elbows and knees. Hehe.

So if you have a hardtail frame, just put a rigid fork, and you've got a rigid bike. But it's not as simple as that, because the frame may have been designed around a certain length of fork. Example is if the bike is spec'd with a 100mm travel fork, if you want to put a rigid fork, it has to have a "suspension-corrected" length, which is roughly around 470mm axle-to-crown.

About the Giant XTC FR, I wonder why Giant had to put "FR" on that frame, which can be quite confusing because "FR" suggests that it's for "freeride". But judging from the frame numbers (geometry), I believe that the frame is still for XC. What the letters "FR" mean, beats me. Maybe they mean "Fast Racing" or something. Hehe.

I see that the Giant XTC built bikes in their website are spec'd with 100mm travel forks. So if you want to use a rigid fork, you have to find one that has 460mm-480mm axle-to-crown length to maintain the frame numbers (geometry).
  #8  
Old 09-26-2011, 10:50 AM
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Default Re: Frame Geometry relative to Rigid Fork

to answer the inquiry about Giant XTC FR frame. it is specifically designed for XC. the FR is quite confusing nga. ginamit nila yun FR to distinguish it from other version Giant XTC na bilog yun mga tubes.

itong XTC FR palapad yun mga tubes. mukhang mas matibay though mas magaan ng konti sa XTC i think due technology.

thanks for all the reply here re my inquiry sa rigid fork
  #9  
Old 10-12-2011, 12:01 PM
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Default Re: Frame Geometry relative to Rigid Fork

So sir, what are the possible problems will I encounter if I continue with my project.I just bought a Mosso rigid fork and if my measurement is correct, the front side of my frame will be lowered by 70mm. The rigid fork will replace my always locked XCR fork. TIA!
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  #10  
Old 10-12-2011, 12:28 PM
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Default Re: Frame Geometry relative to Rigid Fork

Sirs, As per MOSSO tripple butted Alum. rigid fork, Mababago talaga Frame Geometry, Dahil sa Travel aspect. Mag-Lolower ang BB, tendency is Lowered din ang pedal part, which may contribute to pedal contacting the earth's surface (case basis).

From this, (with Suspension Fork)


To this, (with MOSSO tripple butted Alum. rigid fork)


Pero malaki ang diperensya ng weight compared with suspension. and sa Bisikleta Parang ang weight ng front mo is only half of the weight ng Rear.. hehe

Ito po kasi gamit ko, Purely Road., and this is my one and only Bike!.. Hehe
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  #11  
Old 10-12-2011, 03:33 PM
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Default Re: Frame Geometry relative to Rigid Fork

may tanong ako about suspension corrected forks. kasi in theory, kung suspension corrected ang kukuhanin mo...walang magbabago sa geometry 'di ba?

alam ko meron for frames with 80mm travel. pero meron ba for 100mm?

most likely wala na for 120, kasi....it's not really for XC anymore.
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  #12  
Old 10-12-2011, 04:22 PM
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Default Re: Frame Geometry relative to Rigid Fork

Magiging ganito kababa ang harapan ng aking bike mga idol. Ang issue ko ngayon ay ang magiging height ng aking handlebar. Post ko kagad dito kung ano magiging resulta. :)

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  #13  
Old 10-16-2011, 01:49 PM
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sponklong sponklong is offline
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Default Re: Frame Geometry relative to Rigid Fork

Eto na ang kinalabasan. Hindi ko muna pinutol steerer tube, hanapin ko muna pinakaoptimal height ng aking hb. Gumaan rin sya ng 2lbs. Pero nung trny ko iahon sa d wall kanina, naramdaman ko na ang diperensya kumpara nung suspension pa sya. Yung pumepedal, napakahina na. Hindi man lang naiahon sa siko. :)

Palakas muna. Standby lang muna ang pinagpalitang fork. Baka magsawa ring maging pasensyoso sa pagpili ng linyang tatahakin at ang pagiging disiplinado sa pagrelaks ng buong braso.

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  #14  
Old 02-27-2012, 11:58 AM
aramacir aramacir is offline
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Default Re: Frame Geometry relative to Rigid Fork

can i use 80mm FORK for XTC FR frame?
  #15  
Old 02-28-2012, 03:56 PM
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Default Mosso FK26MD2 Rigid Fork



http://mossobike.com/products/fork/FK26MD2-SP.php

Is anyone using this fork? Based from the picture, I think it has some sort of spring/suspension just above its crown. I have seen this one personally in cartimar and it looks good. I have used a Mosso Rigid fork before, the 7005 triple butted straight bladed fork. I used it for urban/road rides. Coming from a FS bike, the mosso 7005 rigid fork was very harsh and hard to ride. So im hoping that this fork will somewhat soften it up for me.

couple of questions:
1) Does it really have a sort of suspension?
2) A-C measurement? equivalent in suspension fork?
3) price?
4) is this for 1 1/8' steerer tube?
4) if you'll check the link, what are those numbers listed on the left side under the model number? (OD:28.6, CR:30)

thanks and hoping to hear from our brothers who are using this fork.

:)
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  #16  
Old 04-17-2012, 10:16 AM
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Default Rigid fork for disc brake

mga idol! ano puede nung irekomenda na good quality & price at magaan sya na rigid fork na puede ang disc brake tsaka matibay sya. many thanks!
  #17  
Old 04-17-2012, 10:33 AM
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Default Re: Rigid fork for disc brake

Quote:
Originally Posted by FrankVillaflor View Post
mga idol! ano puede nung irekomenda na good quality & price at magaan sya na rigid fork na puede ang disc brake tsaka matibay sya. many thanks!
yung mosso po na brand sir, disc and v-brake compatible sya.


meron din yung SaSo, kaya lang disc brake lang yata ang pwede.
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  #18  
Old 04-17-2012, 10:36 AM
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Default Re: Rigid fork for disc brake

Saso, Mosso are both good forks, suspension corrected pa :)

your choice if you're going Alu or Carbon.
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  #19  
Old 04-17-2012, 12:18 PM
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Default Re: Rigid fork for disc brake

many thanks sir emmangulaman & anthrax. may idea po kau ng price range & available ba 'to sa bike shops sa quiapo?
  #20  
Old 04-17-2012, 12:21 PM
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Default Re: Rigid fork for disc brake

MOsso alu sir pwede pang disc pwede pang vbrakes super gaan pa
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