Giro 26 Wheel Juggling

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bobkny
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2012/11/01 06:03:27 (permalink)

Giro 26 Wheel Juggling

Bacchetta's Mark Colliton just published a great discussion of various Giro 26 wheel options on the Bacchetta web site. It covers many of the details and concerns we've been discussing here about various and sundry wheel configurations. In my case, the 26/24 setup is very appealing. I guess the Giro 26 should be re-named the "Swiss Army Knife". Thanks Mark.
post edited by bobkny - 2012/11/08 19:09:24
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    thecanoe
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    Re:Giro 26 Wheel Juggling 2012/11/01 16:20:21 (permalink)
    What a great article. For those looking for it, check it out in the blog. I had a 26x24 Giro setup and thought it was the perfect Bb height for commuting.

    Larry

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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/02 07:07:44 (permalink)
    One good point that Mike made in his write up was the hassle of installing 130 mm rear hubs on 135 mm Giro frames. One possible solution is to use DT Swiss Ratcheting skewers. These were developed by DT for use on frames that made traditional skewer cams hard to use, and for disk brake applications. They aren't cheap - the steel skewers are about $48. I haven't tried them; but I'd like some feed back here if anyone else has tried them.
    These may also do the job: http://www.cheapbikeparts...bolt-on-wheel-skewers/ . A lot less expensive than the DT's --- but you will have to carry a 5 mm allen key. I had a Ti version of these which I used for racing. They were slightly more hassle than a cam quick release; but they worked very well. They also give you somewhat more wheel theft protection -- the thief needs a 5 mm allen key to steal your wheels.
    post edited by bobkny - 2012/11/02 18:26:51
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    Mark Colliton
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    Re:Giro 26 Wheel Juggling 2012/11/05 07:32:27 (permalink)
    FYI, I just added some pictures of my Giro-26 with 24" (507) wheels to the article.
    http://www.bacchettabikes...heel-options#more-1424
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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/08 19:17:40 (permalink)
    Mark Colliton

    FYI, I just added some pictures of my Giro-26 with 24" (507) wheels to the article.
    http://www.bacchettabikes...heel-options#more-1424

    Mark - thanks. I'm thinking about going 26/24 -- but using a Giro 20 ATT as the base bike. I believe that the the Giro 20 ATT and 26 have slightly different frame geometries. Do you - or anyone else have any thoughts about this? I'm pretty sure that the stock Giro 20 ATT fork will work with a 24" wheel -- and you may be able to use dual pivot road brakes as well.
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    thecanoe
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    Re:Giro 26 Wheel Juggling 2012/11/09 04:56:17 (permalink)

    Larry

    Ti Aero
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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/09 06:59:19 (permalink)
    thecanoe

    http://www.bacchettaforum...=30966&high=giro+26x24

    Read through this thread.

    Thanks- looks like there may be a Giro 26/24 in my future! BTW, what's the fatest tire you can run with this set up? I can run a 1.75" tire with my 406 wheel -- but I think that this may not work with a 24".
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    Mark Colliton
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    Re:Giro 26 Wheel Juggling 2012/11/09 12:17:30 (permalink)
    FYI, the Giro-20 and Giro-26 have different head tube angles so their geometry is more than slightly different.

    24” front wheel on the Giro-20.

    Keep in mind that the 24” wheel referred to in the Canoe thread is the 520mm rim size and, in general, the only rubber available for this size rim is the skinny roadie type. That’s fine because anything bigger than 1-1/8” will not fit the stock fork. Also, the smallest tires you can find for the other 24” rim size (507mm) is 1.5” and that size will not fit in the stock 20” fork. So if you want to convert your Giro-20x26 to a 24x26 you will have to do so using the 520mm rim size.

    Mark

    Bacchetta Bicycles, Inc.
    http://www.bacchettabikes.com/


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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/09 12:57:05 (permalink)
    Mark Colliton

    FYI, the Giro-20 and Giro-26 have different head tube angles so their geometry is more than slightly different.

    24” front wheel on the Giro-20.

    Keep in mind that the 24” wheel referred to in the Canoe thread is the 520mm rim size and, in general, the only rubber available for this size rim is the skinny roadie type. That’s fine because anything bigger than 1-1/8” will not fit the stock fork. Also, the smallest tires you can find for the other 24” rim size (507mm) is 1.5” and that size will not fit in the stock 20” fork. So if you want to convert your Giro-20x26 to a 24x26 you will have to do so using the 520mm rim size.

    Mark

    Bacchetta Bicycles, Inc.
    http://www.bacchettabikes.com/


    Mark - thanks for the clarification. 24" on the Giro 20 may not be such a great idea after all. The Giro 20 seems to work best as designed, with a 26" rear and 406 front. I've already experimented with a 700c in the back. I got it to work -- but aside from the previously discussed problem of using a 130 mm hub, the bike didn't perform any better, and never felt as stable and secure. I suspect that the Giro 26 may be a better "shape shifter".  In the meanwhile, I purchased a second set of stock 26/406 wheels in order to run fat tires on dirt and gravel roads in NH, as well as packed sand on the beach at Hilton Head Island SC.
    Bob
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    RAT Rider
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    Re:Giro 26 Wheel Juggling 2012/11/10 08:43:01 (permalink)
    I know 5 mills isn't much, but I thought squeezing aluminum was a bad idea.

    RAT Riders
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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/10 09:50:32 (permalink)
    RAT Rider

    I know 5 mills isn't much, but I thought squeezing aluminum was a bad idea.

    My $.02: You may be right; but I've owned several Aluminum framed bent's - GRR, MP, Rans Zenetic, Giro 20 ATT. The rear wheel fit on all of these frames seemed to require some squeezing of the drop outs - even using wheels that where supposed to be compatible. While this fitting issue sometimes makes wheel installation a PITA, all of these bikes functioned quite well over many thousands of combined miles of riding. The main argument I've read about not squeezing dropouts - on any frame regardless of material- is that this will distort the alignment of the dropouts. While this argument may have some validity, in my personal experience with many bikes, is that any distortion of dropout alignment is well within the design tolerance of the frame. BTW, I just ordered these on Amazon: http://www.amazon.com/gp/...oh_details_o01_s00_i00 . As I said in an earlier posting, I hope that this will solve the wheel installation issue. You do have to make sure however, that you have a 5 mm hex key in your bike bag.
    #11
    Wolfie621
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    Re:Giro 26 Wheel Juggling 2012/11/10 10:27:27 (permalink)
    Here is another question. I am also installing 520 tires on my Giro ATT. 26/20. What forks can I get to replace to front one? All the weight for this bike is in the front forks and I want to get a carbon style one to bring that down but still want to use the disc brake setup.
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    bobkny
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    Re:Giro 26 Wheel Juggling 2012/11/10 13:15:51 (permalink)
    Wolfie621

    Here is another question. I am also installing 520 tires on my Giro ATT. 26/20. What forks can I get to replace to front one? All the weight for this bike is in the front forks and I want to get a carbon style one to bring that down but still want to use the disc brake setup.

    This might work for you: http://www.carboncycles.cc/?p=587& . Also comes in a 24" model which may match the stock Giro 20 fork. Not sure however if the "IS" disk brake mount is compatible.
    #13
    timturner
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    Re:Giro 26 Wheel Juggling 2012/11/10 16:05:06 (permalink)
    what carbon fork does Bacchetta use on the Corsa 24?
    For some reason, I thought  there was a 24" carbon johnson.
     
    T
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    Mark Colliton
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    Re:Giro 26 Wheel Juggling 2012/11/12 09:05:54 (permalink)
    FYI, we do make a 24” Carbon Johnson fork but it does not have the disc mount that Wolfie621 is looking for. Also, the 24” Carbon Johnson, with a 300mm steer tube, weighs 20oz. The 20” aluminum ATT fork, with a 300mm steer tube, weighs 24oz. The 20” eXotic carbon fork that Bobkny pointed us to weighs 26.4oz. The ATT fork may not be the lightest thing out there but it certainly isn’t heavy.
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    gizmo139
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    Re:Giro 26 Wheel Juggling 2012/11/12 11:21:35 (permalink)
     
    Mark Colliton
    24” front wheel on the Giro-20.

    Keep in mind that the 24” wheel referred to in the Canoe thread is the 520mm rim size and, in general, the only rubber available for this size rim is the skinny roadie type. That’s fine because anything bigger than 1-1/8” will not fit the stock fork. Also, the smallest tires you can find for the other 24” rim size (507mm) is 1.5” and that size will not fit in the stock 20” fork. So if you want to convert your Giro-20x26 to a 24x26 you will have to do so using the 520mm rim size.
    Mark .....Bacchetta Bicycles, Inc.
    http://www.bacchettabikes.com/

     
    Good stuff ..... I'll bite  
     
    Got a SMALL G20 disc I'd like to try this 24" trick with.  Not that I have anything against Mark Powell but ... Just spent 3 hours trying to beat the high cost issue.....though I'm not confident the parts menu leads to a happy meal.
    Would greatly appreciate your expert evaluation of following with particular attention to rim / tire width vs fit in stock fork.
    Tire choices are slim - concerned about lateral stability vs rim actual width vs tire width.  (don't know what "wide sleeved" means: description says 1-1/8" but specs say wdth is 21.6mm = 0.85" ????)  see >>>>  http://www.universalcycles.com/shopping/product_details.php?id=48391&category=3874
    Its a pretty shallow cross-section rim (17mm deep) but I think its 36 holes will make it strong enough anyway ?
     
    Given small image upload size - using screen zoom @ 200% will be more readable.
     
    Thanx for any tips you might care to share ..... John G. 
       


     
    post edited by gizmo139 - 2012/11/12 14:36:28

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    Wolfie621
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    Re:Giro 26 Wheel Juggling 2012/11/12 13:10:11 (permalink)
    FYI, we do make a 24” Carbon Johnson fork but it does not have the disc mount that Wolfie621 is looking for. Also, the 24” Carbon Johnson, with a 300mm steer tube, weighs 20oz. The 20” aluminum ATT fork, with a 300mm steer tube, weighs 24oz. The 20” eXotic carbon fork that Bobkny pointed us to weighs 26.4oz. The ATT fork may not be the lightest thing out there but it certainly isn’t heavy.
     
     
    Mark
    So will the 20 fork fit a 520 tire then. I am trying to make the front end lighter for long distane riding. My roommate has a strada and you can definitely feel the diffent in the two in the front end.
     
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    Mark Colliton
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    Re:Giro 26 Wheel Juggling 2012/11/12 14:31:56 (permalink)
    Yes, a 520 wheel with a 1-1/8" tire will fit in the stock 20" alloy fork on the ATT. What makes the ATT front end feel heavy is the disc wheel, disc brake and fat tire. Replace them with nice 520 wheel and tire and a Bacchetta road brake and you will be surprised how much lighter the front end is. It's faster too. Remember, the 24" wheel only works in the Medium/Large frames. If you have a small frame Giro you'll have issues with the crank arms hitting the wheel.
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    thecanoe
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    Re:Giro 26 Wheel Juggling 2012/11/12 20:04:14 (permalink)
    This needs to be repeated.
    Remember, the 24" wheel only works in the Medium/Large frames. If you have a small frame Giro you'll have issues with the crank arms hitting the wheel.

    Larry

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    Santa Cruz Tallboy carbon 29er
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    Wolfie621
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    Re:Giro 26 Wheel Juggling 2012/11/13 10:57:18 (permalink)
    Thanks for the information. I have the med/large frame.
    #20
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