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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 08-18-08, 12:06 PM   #1
this1time
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Help: Mark V back brake bridge measurement...!!!

umm, so i've a bit of a dilemma: i just purchased an iro lc (mark v) off of pricepoint. took it over to my bike tech/friend's house to have him set it up. every thing's going fine until we set it on the ground to get a better fit and notice that the back wheel is rubbing up against the brake bridge!! wtf! then i check out the tire and notice that iro sent it with 700x28 tires and not the 700x23! (...hmmm, thought they looked a bit big)

but here's the thing, my friend feels that it's not just the tire, but that the back brake bridge is too low! is this possible? can someone with a 56 frame measure the bottom of the bridge to the drops and let me know the distance? (i measured from the outside of the seat stays down to the drop and got 14.25, on my gf's 50 i got 14.5. this is what led my friend to believe that it was set too low and that they should both be the same distance.)

ughh...oh, and the water bottle bosses are too low as well! it looks like the top one should be the bottom from looking at other mark v's, including my gf's. seriously, if i put a bottle bracket on it would be rubbing up against the chain!

all in all it's pretty embarassing to have a friend look at your bike and be like, man, this is cheap...

any help is definitely appreciated!

oh, and sorry for starting yet another iro thread, i just know this would get lost with all of the picture posts!

Last edited by this1time; 08-18-08 at 02:49 PM. Reason: re-post
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Old 08-18-08, 02:48 PM   #2
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sorry to bump my own thread, but...
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Old 08-18-08, 02:58 PM   #3
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You should give IRO a call. They have a good rep for customer service.
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Old 08-18-08, 03:07 PM   #4
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pics
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Old 08-18-08, 05:17 PM   #5
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if i take my tape hook my drop out and run it up to the bottom of the bridge i get 14 3/16 from the intersection of the the seat stays to the seat tube i get 5 1/8.......There you are now yours measures? Thats on the mrk V allso
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Old 08-18-08, 05:37 PM   #6
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??

also, what size do you ride?
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Old 08-18-08, 05:45 PM   #7
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thats on a 56
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Old 08-19-08, 12:07 AM   #8
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so, yeh, pics:

back brake bridge
http://www.flickr.com/photos/brokecrooks/2776683995/
http://www.flickr.com/photos/brokecrooks/2777541440/
http://www.flickr.com/photos/brokecrooks/2777507224/

fork and brake
http://www.flickr.com/photos/brokecrooks/2777507110/

bosses
http://www.flickr.com/photos/brokecrooks/2777506994/
http://www.flickr.com/photos/brokecrooks/2777506892/

sorry for the links, not on my computer right now....

nelzar, when i measure by hooking my tape measure into the drop and go up i get 14" exactly. from the top of the break bridge to the seat tube i get 5 5/8"

thanks for the help. guess i'll call iro in the afternoon and hopefully get an answer...

Last edited by this1time; 08-19-08 at 12:25 AM.
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Old 08-19-08, 02:01 PM   #9
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ya i dont think mine hits even if i run my wheel slammed
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Old 08-19-08, 03:22 PM   #10
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yeh, it's weird, though i'm sure a 700x23 would fit fine. i called iro but no one answered so i sent an email explaining everything...ughhh, this is turning into such a pain in the ass when all i want to do is get out and ride!
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Old 08-19-08, 09:53 PM   #11
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where is your wheel in the dropouts? if you move it back in the dropouts it will move the tire away from the bridge.
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Old 08-19-08, 10:11 PM   #12
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Could you be putting 700c wheels in a 650c frame? I'm not even sure what that would look like but thought I'd throw it out there.
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Old 08-19-08, 10:17 PM   #13
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i have the same bike, 56 lc i got from an LBS about a year ago. mine measured 14" as well, and exactly 2cm from the middle of the brake mount to the top of my tire (700x23). i never thought about mounting a water bottle so i never noticed if it was too low, but it measured 6in from the bottom water bottle mount to the top of the BB shell. i dont have any better pictures of my brake mount but i found these pictures i took awhile ago that might give you a decent idea for the watter bottle bosses. just for reference thats a 48 tooth chainring.





and i know this is off topic but what pedals are you riding?
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Old 08-19-08, 10:22 PM   #14
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I don't see anything wrong with the bottle mount position. I've got a bike that has to have spacers under the cage to allow it to clear the front derailleur clamp, which goes between the mounting bosses. Yours looks like it would be in a similar position if you had a front derailleur. Have you tried mounting a cage?
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Old 08-20-08, 12:59 AM   #15
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petebow: here's a pic of the back hub in the dropout.
http://www.flickr.com/photos/brokecrooks/2779952709/
at this point, there is no way i could move the tire back without a longer chain!

ryker: i would assume not since this is a stock iro build. i haven't done a single modification to it.

chris: seriously, thanks for the pics! so 14" is what i got as well. maybe it was sent with too small of a chain. other's seem to fit larger tires than the 28s on mine without a problem so i can't see why this would be different, especially with a 1/4" amount of space between the fork and front tire. and the bottom bottle boss measures 4" from my bb! seems way low to me!

oh, and the pedals are mks gr-9s.

krusty: nope, haven't tried to actually mount a bottle cage nor did i really plan to. really, if i needed one, i would just get a strap on. it was just the low mounting compounded with what seemed to be the low brake bridge and larger set of tires that i got with the bike...not to mention getting a silver cranket instead of the black crankset in the picture and a non iro branded seat.
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Old 08-20-08, 04:37 AM   #16
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man thats wierd iv never heard of frames varying th much are the just that good where they gave up using jigs to build there bikes and have moved on to freehand building? wow!
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Old 08-20-08, 10:21 AM   #17
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so tony wrote me back. this is what he said:

"The LC and Mark V are not the same bike. So you can't compare geometry. If you add a link to your chain it should move the wheel back so there is not an issue. Not sure what to tell you about the water bottle mount. What type of cage are you using?"

i wrote him back saying thanks, that i would try that, and then i let him know that most people were under the impression that the iro lc and the mark v were one and the same. hopefully i'll get an answer about the differences in geometry! at least that explains why chris' measurements matched mine but nalzar's didn't! would love to get it to the shop as well but it's been pissing down in houston!
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Old 08-20-08, 10:37 AM   #18
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Quote:
Originally Posted by this1time View Post
so tony wrote me back. this is what he said:

"The LC and Mark V are not the same bike. So you can't compare geometry. If you add a link to your chain it should move the wheel back so there is not an issue. Not sure what to tell you about the water bottle mount. What type of cage are you using?"

i wrote him back saying thanks, that i would try that, and then i let him know that most people were under the impression that the iro lc and the mark v were one and the same. hopefully i'll get an answer about the differences in geometry! at least that explains why chris' measurements matched mine but nalzar's didn't! would love to get it to the shop as well but it's been pissing down in houston!
thats interesting. a few months ago i was trying to figure out exactly which bike i had, because i needed the geometry. i emailed iro saying i didnt know which one it was but i bought it at the LBS, removable decals, etc. this was the email i got back:

Chris, We call that bike the LC it is a bike shop only bike. We do not sell them on the site.
It has the same geometry as the Mark V.

Best Regards,
Tony

and from what i can tell in comparison with some mark Vs, it is the same geometry.
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Old 08-20-08, 11:27 AM   #19
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so, did yours have removable stickers!?! mine, nor my gf's, did not! and that was something that was advertised on pricepoint. i don't know, maybe they are removable, only they look and feel like paint and there is no visible decal line...maybe they're satin like model decals (water transfer)? how did your decals come? how were they removed?

really weird about the geometry, wondering what tony will say! ughh...the mystery continues.

Last edited by this1time; 08-20-08 at 01:16 PM.
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Old 08-20-08, 09:14 PM   #20
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sorry, bump for chris...
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