burn me on a stake I've modernised my 94 lava dome

[ovlov440]

...isn't it slightly overbraked at the rear - 'V's and a disc

 

[dvatcmark]

Nah the disc doesnt seem to work very well for some reason

 

[We_are_Stevo]

There's a lot of debate on here re the foibles of fitting too long a fork to a retro frame; but there's only 20mm difference between a period Judy and the fork you have...

...how bad can it be?

If you like the way it looks and rides then it's okay in my book

This is a modern 100mm fork. It's a lot more than 20mm longer than a 63mm Judy.

10mm sag on the 80mm travel fork would equate to around 20mm for a 100mm travel fork, ergo your 100mm fork is only around 20mm longer than the period fork...

...and perfectly useable

 

[thecannibal]

There's a lot of debate on here re the foibles of fitting too long a fork to a retro frame; but there's only 20mm difference between a period Judy and the fork you have...

...how bad can it be?

If you like the way it looks and rides then it's okay in my book

This is a modern 100mm fork. It's a lot more than 20mm longer than a 63mm Judy.

10mm sag on the 80mm travel fork would equate to around 20mm for a 100mm travel fork, ergo your 100mm fork is only around 20mm longer than the period fork...

...and perfectly useable

The travel is not the only factor in a fork's length. Modern 100mm forks are much longer than '95 Judys.

Easy on the advice unless you actually know something, eh?

 

[Andy B]

Axle to crown is more important than travel though as it can vary between forks manufacturers & models

I know that the 85mm Reba on my Clockwork has a A-C of 460mm

With 25% sag that makes it 438.75mm A-C

So say the 100mm Reba fork in question on the OP's bike has an A-C of 475mm

25% sag makes it an A-C of 450mm

Generally 25% sag is regarded as a starting point for XC forks, some folks run up to 30% sag

with 30% sag the figures look slightly better with an A-C of 445mm on a 100mm Reba fork

Assuming that this Reba in question is the same as mine, it certainly looks it.

 

[We_are_Stevo]

There's n'owt wrong wi' the 'modified' geometry of the bike in the OP's photo's; the angle the initial photo' was taken from has exaggerated the angle of the seat post, but other than that the bike is fine...

...If Chas Roberts says you can fit a 100mm fork to one of his '90s frames then I'm inclined to take more notice of him, being as how he built it!

 

[thecannibal]

There's n'owt wrong wi' the 'modified' geometry of the bike in the OP's photo's; the angle the initial photo' was taken from has exaggerated the angle of the seat post, but other than that the bike is fine...

...If Chas Roberts says you can fit a 100mm fork to one of his '90s frames then I'm inclined to take more notice of him, being as how he built it!

But you didn't just say that. You said that there's little difference in the length of a mid '90s 63mm Judy and a modern 100mm Reba, which is totally wrong. If we all stick to imparting knowledge we actually posses, rather than making uninformed guesses, then this site can be a useful resource.

 

[dvatcmark]

Those measurements sound about right, with a long ruler measuring the forks on the bike (i.e some error) the reba has an a to c of around 470mm and my judy 430mm. Three next trial is the reba dropped down to 80mm.

Although even with the slacker angles, I still preferred the ride over the lava dome over my mini mula with the judys, because of the better fork performance of the reba.

earlier today I measured the frames angles using autocad and the head angle with the rebas with no sag is around 65 degrees, moving to 67 with 25mm sag

 

[Andy B]

Those measurements sound about right, with a long ruler measuring the forks on the bike (i.e some error) the reba has an a to c of around 470mm and my judy 430mm. Three next trial is the reba dropped down to 80mm.

Which should give an A-C of 435mm @ 25% sag, or 431mm @ 30% sag

A 65mm Judy with a 430mm A-C will give a 413mm A-C @ 25% sag

But these are just figures. It's what the bike rides like that really matters

So long as you don't snap the head tube off by running the forks too long...*



* highly doubt this would happen, but you never know

 

[dvatcmark]

Geometry theory aside, I found the ride more enjoyable than my 04 caldera