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General Category >> Technical >> RANS Dual 26" Fork measurement
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Message started by MrOverdressed on Jan 6^th, 2010, 11:17am

Title: RANS Dual 26" Fork measurement
Post by MrOverdressed on Jan 6^th, 2010, 11:17am

If your bike has a RANS Dual 26" Fork (Stratus XP or V3) with 26' Mtn (ISO 559) rims. Please meause the distance in Millimeters from the TOP of the wheel rim (*not* the top of the tire) upto the bottom of the forks stearer. I want to know know many millimeters clearance there is. :)

http://www.shoprans.com/images/bpfk0020.jpg

Title: Re: RANS Dual 26" Fork measurement
Post by aikigreg on Jan 6^th, 2010, 12:07pm

Why not ask rans?

Title: Re: RANS Dual 26" Fork measurement
Post by MrOverdressed on Jan 6^th, 2010, 1:40pm

aikigreg wrote:

Why not ask rans?

And miss out on some lively fun RBENT discussion? Bah Humbug! >:(

Title: Re: RANS Dual 26" Fork measurement
Post by FlyingLaZBoy on Jan 6^th, 2010, 2:37pm

I'm not sure I want to know why you're asking this....

HOWEVER, in the interest of science, and in the spirit of "measure twice, cut once"...

Note that the edge of the rim and the fork itself are NOT perpendicular in your area of concern. The closest distance from rim to fork crown is at the very front edge of the fork crown, so that's your critical point.

http://i977.photobucket.com/albums/ae256/pbrown8js/Fork1.jpg

Looks to be right at 2 inches (~50mm) clearance, or slightly less, from rim to fork inside top...

http://i977.photobucket.com/albums/ae256/pbrown8js/101_5268.jpg

Granted, after four years and 18,000 miles, the wind might have worn some of the thickness off of my SXP fork... YMMV :D

Title: Re: RANS Dual 26" Fork measurement
Post by jayg on Jan 6^th, 2010, 3:53pm

The rim to fork clearance on my RANS Fusion is also 2". It has the same fork and 559 rims.

Title: Re: RANS Dual 26" Fork measurement
Post by jcsadowski on Jan 6^th, 2010, 3:53pm

Quote:

the wind might have worn some of the thickness off of my SXP fork.

OR maybe all that riding may have squished the fork a little.

Title: Re: RANS Dual 26" Fork measurement
Post by aikigreg on Jan 6^th, 2010, 3:56pm

jcsadowski wrote:

Quote:

the wind might have worn some of the thickness off of my SXP fork.

OR maybe all that riding may have squished the fork a little.

Are you calling Paul fat? Thankfully carbon doesn't squish. It does make a lovely crunch though!

Title: Re: RANS Dual 26" Fork measurement
Post by MrOverdressed on Jan 6^th, 2010, 5:08pm

Thanks gentlemen! I was using the 559 rim as a reference point to see how much clearance was available for other rim/tire combos. Look like there is enough clearance for a 650C (ISO-571) rim+tire but not a 700C (ISO-522) rim+tire. [smiley=cool.gif]

Title: Re: RANS Dual 26" Fork measurement
Post by jayg on Jan 6^th, 2010, 6:27pm

MrOverdressed wrote:

Look like there is enough clearance for a 650C (ISO-571) rim+tire but not a 700C (ISO-522) rim+tire. [smiley=cool.gif]

Tried a 650c x 23 rim and tire on the fork - 30 mm clearance between the fork and tire. Also, tried a 700c x 23 rim and tire - 1.5 mm clearance.

Title: Re: RANS Dual 26" Fork measurement
Post by MrOverdressed on Jan 6^th, 2010, 6:33pm

jayg wrote:

Tried a 650c x 23 rim and tire on the fork - 30 mm clearance between the fork and tire. Also, tried a 700c x 23 rim and tire - 1.5 mm clearance.

A 700c x 23??? Wow that’s unexpectedly tempting. :)

Title: Re: RANS Dual 26" Fork measurement
Post by evblazer on Jan 6^th, 2010, 8:42pm

MrOverdressed wrote:

[quote author=jayg link=1262798231/0#8 date=1262824061]

Tried a 650c x 23 rim and tire on the fork - 30 mm clearance between the fork and tire. Also, tried a 700c x 23 rim and tire - 1.5 mm clearance.

A 700c x 23??? Wow that’s unexpectedly tempting. :)[/quote]

1.5 mm is a good bit of clearance but what was that tire? When I ran some 700x23 armadillos on my road bike I could barely shove a piece of paper through there until I sanded down the tire a bit otherwise it would rub when I pedaled really hard. After they started shedding gobs of tread I switched to some 700x23 conti gatorskins and I have lots of clearance so just get a short tire and you'll be great. For brakes if you don't have long enough reach clipers mavic makes a nice Vbrake adjustment horseshoe shaped thingy to move the brakes up from a 26" to a 700" rim which xtracycle used to sell for people who used 700c wheels with their add on kit designed around 26" wheels. Me.. I'd run some nice 26x1.35 kojaks ;)

Title: Re: RANS Dual 26" Fork measurement
Post by MrOverdressed on Jan 6^th, 2010, 8:51pm

PCE makes brakes that allow you to run 700C on mountin bikes:
http://www.paulcomp.com/motobmx.html

It works because the brake steams allows someone to slide to shoe up/down to adjust for different wheel sizes.

http://www.paulcomp.com/images/motobmxmain.png

Title: Re: RANS Dual 26" Fork measurement
Post by jayg on Jan 6^th, 2010, 9:25pm

evblazer wrote:

1.5 mm is a good bit of clearance but what was that tire?

Michelin Pro3 Race Road Cycling Tire

Title: Re: RANS Dual 26" Fork measurement
Post by evblazer on Jan 6^th, 2010, 11:57pm

MrOverdressed wrote:

I've seen those on a few bents hopefully they are stiffer then what dahon uses. My wife has long reach v brakes on her dahon and they really really flex after the pad meets the rim total trash but for almost 160 hopefullty the pauls are better.
The mavic ones I got for about $15 at the LBS are pretty solid and allow you to keep whatever brakes you might already have. Just an option for some who might not know they exist as are those spiffy adjustable brakes.
http://www.webcyclery.com/image.php?productid=17608&ver=large