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  1. #1
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    Mojo HDR 150mm build 650b

    Ok, I want to start a new thread for the HDR specific to a build with a 150mm fronk fork and the 1500mm rear shock and 27.5" wheels.
    I see references that this build is supported, but I would love to hear some real world feedback as to how it rides and the rear tire sizes that will fit and also the steer tube head angle/BB height.
    I would like to use a 2.3" Hans Danf 27.5" front and rear.
    This really seems like the perfect bike to me and is a one to one match for the SC Bronson.
    I have been on my Mojo for over 6 years and need a new bike soon. I do not want to change from the DWLink.
    Thanks

  2. #2
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    fronk fork and the 1500mm rear shock ??

    That would be a bad combination! Ha

  3. #3
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    Wow, your right, 1500mm fork would be too much..lol
    Alright, let's back off to 150mm fork...
    Anyone built one up this way or is planning on it ?
    I imagine Ibis has tested this a little ?
    I hope

  4. #4
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    Quote Originally Posted by dcpowpow View Post
    Ok, I want to start a new thread for the HDR specific to a build with a 150mm fronk fork and the 1500mm rear shock and 27.5" wheels.
    I see references that this build is supported, but I would love to hear some real world feedback as to how it rides and the rear tire sizes that will fit and also the steer tube head angle/BB height.
    I would like to use a 2.3" Hans Danf 27.5" front and rear.
    This really seems like the perfect bike to me and is a one to one match for the SC Bronson.
    I have been on my Mojo for over 6 years and need a new bike soon. I do not want to change from the DWLink.
    Thanks
    It's good timing that you started this thread as new info is needed and coming in currently.

    Please keep in mind this travel on the HD and now HDR is something that people have figured out on their own, this has not been an Ibis spec shock set up. We are into helping people figure out the best way forward if they want to do it, but keep in mind, since we're the manufacturer, we will likely take the more conservative approach on most decisions in order to make sure there is good result for the most people.

    The larger tires will not fit in the HDR frame at 150 travel due to interference with the back of the seat tube at bottom out. So if you configure an HDR this way you have to limit the travel to 140 or 145 depending on tire size.

    We were told today that Fox will not build or rebuild the shocks with travel limit spacer without an official shock spec, which does not currently exist. So, we will discuss if we want to make it official and an Ibis spec shock, and keep you all posted here on this new thread.

    Hans

  5. #5
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    Fork options that could go both 26 and 27.5?

  6. #6
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    Hans and all

    I ran a 7.875 x 2.25 Roco TST air set with 140mm limbo chips. It Cleared the 2012 HD (142 rear) in 650 b mode with Flow ex rims and an ardent 2.25. I guestimated theoretical 150mm+- of travel.

    Is running a 2.25 stroke possible with the 130mm chips? 130mm or 5.12" would equal a 2.56 leverage ratio. So 2.25" stroke x 2.56 = 5.7" or approximately 146mm.

    So you would wind up with similar travel compared to the shimmed 8.5x2.5 shock.

    The BB should be the same as 130 mode but the main issue is if the rear tire contacts the seat tube?

  7. #7
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    Hans, thanks for the reply. I think even 140mm or 145mm in the rear with up to 150mm fork would be nice. Thanks for keeping this in mind and we look forward to more info. Hopefully Ibis can get is worked out where they have a spec'd version with this type of shock on it.
    My current ride is a Mojo (2008 frame) with a Fox 150mm fork, a 27.5" front wheel and keeping with the 26" rear wheel and 140mm shock.
    So, I think this HDR is going to be the perfect bike for me and will be fun configuring.

  8. #8
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    Here is what I am thinking....
    using my current HD with a 160-130 talas 2014 34 fork. Utilising my coil rc4 shimmed down (to approx 154mm) that I already use with my HD for bigger days. This will be my setup until the new rear triangle is available. When it is add the new rear triangle and a shock (assume I will be able to buy these as a package?) so I can drop the travel to 130 front and rear for trail days...thoughts? will my current rc4 coil work in 150ish mode on the new triangle?

    OR

    Same combo but with 26 for the 160 mode, and 650 wheels for the 130 mode, again using a fox 34 fork, but this time as a 26 model fork (if it will fit 650)
    Thoughts on practicality/geometry?
    also, and this is a bit random, I have the s and s soft case for travel with the mojo, tis an awesome case but wondering if anyone has the case and has tried it with 27.5 wheels?

  9. #9
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    Hey dcpowpow - A 650B 150mm fork and shimmed 8.5x2.5 shock is going to ride pretty much the same as a HD160 conversion today. Same Geo, same BB height and I expect very similar rear tire clearance, which means something up to a 2.25 Hans Dampf in size. To me challenge is BB height. You add 12.5mm to the posted 26" Geo. A 160mm 34 Float has a A2C of 537.9mm, a 36 Float 545mm. A 150mm 650B 34 Float is 544.5mm so a wash with the HD160 posted geo with a 12.5mm higher BB and SO. Offset bushings drop it down 10mm but you need a bigger shim and it slacks the HA ~ 1 degree.

    Derby's thread on HD 650B conversion is the best place to start

    -Shane
    .
    Quote Originally Posted by dcpowpow View Post
    Hans, thanks for the reply. I think even 140mm or 145mm in the rear with up to 150mm fork would be nice. Thanks for keeping this in mind and we look forward to more info. Hopefully Ibis can get is worked out where they have a spec'd version with this type of shock on it.
    My current ride is a Mojo (2008 frame) with a Fox 150mm fork, a 27.5" front wheel and keeping with the 26" rear wheel and 140mm shock.
    So, I think this HDR is going to be the perfect bike for me and will be fun configuring.
    Any sufficiently advanced technology is indistinguishable from magic
    - Arthur C. Clarke

  10. #10
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    I'm thinking a spaced rear shock for 145mm travel (does this reducer make shock length shorter, making the bikes unsagged point lower than before like using a shock bushing?) and a 36mm, 26",160mm fork spaced down to 150mm.

    Anyone have a clue on what the geo would be like? BB and HA?

  11. #11
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    Dropping your fork A2C 10mm will steepen your HA just under 0.5 to ~67.5 and drop your BBH ~3.5mm. The 650B conversion adds 12.5mm to your BBH so net you are up 9mm to ~ 361mm (a bit under 14.25") depending on tires.

    Think you may also want to consider using a 7.875x2.25 shock in HD140 mode. Basically the same travel but BBH will be back to 13.75" which is about where you are today in 26 HD160 mode.

    Your other option is offset bushing which lower the BBH back down ~ 10mm, slack the HA about a degree but need more shock shimming to avoid the rear tire hitting the ST. The bushing also make the suspension more progressive which aligns with the shimming - you want to stop the travel before you get to the ugly part of the curve.

    linkagedesign.blogspot.com/2011/10/casquillos-excentricos.html - Translator


    -Shane

    Quote Originally Posted by Yody View Post
    I'm thinking a spaced rear shock for 145mm travel (does this reducer make shock length shorter, making the bikes unsagged point lower than before like using a shock bushing?) and a 36mm, 26",160mm fork spaced down to 150mm.

    Anyone have a clue on what the geo would be like? BB and HA?
    Any sufficiently advanced technology is indistinguishable from magic
    - Arthur C. Clarke

  12. #12
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    HDR 650b clearance theory and HD 650b facts

    Without hands on measuring the HDR130/650b, I would estimate that using offset shock mount bushings will lower the BB and shorten travel of an HD140 to the same as the HDR130. For reference, accurately measured, without offset shock bushings the HD140 with 140mm fork and Neo-moto 650bx2.3 tires has a 13.75" BB height; and the HD140 with no custom mods by just bolting on a 2.25 stroke shock does not rub the seat tube doing aggressive trail riding under my 200+ lb ride weight, but with no large drops to flat landings adding extra flex travel.

    I'm pretty sure the HDR130/650b and HD140/650b having offset shock mounts, either frame making a 13.5" BB height, WILL NOT CLEAR the seat tube with 650bx2.3 tires with a 2.25 stroke shock. In other words the HDR130/650b max travel with custom shimmed stroke limited 7.875x2.25 shock would get about 140mm, maybe about 142mm maximum travel with safe seat tube bottom-out clearance for 650bx2.3 tires.

    The HDR with shock mount chips the same as the HD160 will have a 1/2 inch higher BB height with the same 140mm fork compared to the HDR130 with the same fork and wheels, so custom travel limiting a 2.5 stroke HDR160/26 2.5" shock to 2.25" stroke for 650b wheels will allow 150mm travel with short 650bx2.3 Neo-moto tires. And with a 150mm travel fork the HDR150/650b BB height will be 14.125", same as a 650b converted HD160.

    Perhaps Ibis could design a 1/4 inch removable shock stroke and air volume reducer shim, and possibly a second shim 3/8 inch thick for using larger than 2.3 tires but a little less travel, with the easy instructions how to add or remove the shims from a 8.5x2.5 shock.

    Here's some old posts on converting Mojo's to 650b....

    Mojo HD 650b. The HD140 clears 650bx2.3 with no custom modification, and is sanctioned by Ibis. The HD160 requires custom shock bottom travel limit shims.
    http://forums.mtbr.com/650b-27-5/650...ty-731083.html

    Mojo C, SL, and SLR 650b conversions with required custom shock shim limiting bottom travel clears up to 2.3 tires with less swing-arm clearance than an HD. (SLR clears 2.1 smaller volume 650b tires.)
    http://forums.mtbr.com/650b-69er-new...jo-438747.html

    Shock Bottom shim instruction
    http://forums.mtbr.com/650b-27-5/650...ce-623853.html

    Shock mount offset bushings. Lowers the BB 1/4 inch, and reduces bottom travel tire clearance. There are other options if you search google. These were least expensive and are well made. The HD has 40mm and 22mm wide shock mounts, both with 8mm shock mount bolt holes. It took 3 weeks for the two I bought on eBay to arrive from Poland.
    Offset Shock Bushings Mounting Hardware Mount Kit All Frames Proshox | eBay

  13. #13
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    some confusion

    why would you opt for a HDR 130mm 650b when you can fit 650b on a HD 140 , and get a extra 10mm ... with the HDR you loose 10mm but gain tire clearance ...

    Why cant i have a 140mm HDR ?

    or am i missing the whole point?


    Quote Originally Posted by derby View Post
    Without hands on measuring the HDR130/650b, I would estimate that using offset shock mount bushings will lower the BB and shorten travel of an HD140 to the same as the HDR130. For reference, accurately measured, without offset shock bushings the HD140 with 140mm fork and Neo-moto 650bx2.3 tires has a 13.75" BB height; and the HD140 with no custom mods by just bolting on a 2.25 stroke shock does not rub the seat tube doing aggressive trail riding under my 200+ lb ride weight, but with no large drops to flat landings adding extra flex travel.

    I'm pretty sure the HDR130/650b and HD140/650b having offset shock mounts, either frame making a 13.5" BB height, WILL NOT CLEAR the seat tube with 650bx2.3 tires with a 2.25 stroke shock. In other words the HDR130/650b max travel with custom shimmed stroke limited 7.875x2.25 shock would get about 140mm, maybe about 142mm maximum travel with safe seat tube bottom-out clearance for 650bx2.3 tires.

    The HDR with shock mount chips the same as the HD160 will have a 1/2 inch higher BB height with the same 140mm fork compared to the HDR130 with the same fork and wheels, so custom travel limiting a 2.5 stroke HDR160/26 2.5" shock to 2.25" stroke for 650b wheels will allow 150mm travel with short 650bx2.3 Neo-moto tires. And with a 150mm travel fork the HDR150/650b BB height will be 14.125", same as a 650b converted HD160.

    Perhaps Ibis could design a 1/4 inch removable shock stroke and air volume reducer shim, and possibly a second shim 3/8 inch thick for using larger than 2.3 tires but a little less travel, with the easy instructions how to add or remove the shims from a 8.5x2.5 shock.

    Here's some old posts on converting Mojo's to 650b....

    Mojo HD 650b. The HD140 clears 650bx2.3 with no custom modification, and is sanctioned by Ibis. The HD160 requires custom shock bottom travel limit shims.
    http://forums.mtbr.com/650b-27-5/650...ty-731083.html

    Mojo C, SL, and SLR 650b conversions with required custom shock shim limiting bottom travel clears up to 2.3 tires with less swing-arm clearance than an HD. (SLR clears 2.1 smaller volume 650b tires.)
    http://forums.mtbr.com/650b-69er-new...jo-438747.html

    Shock Bottom shim instruction
    http://forums.mtbr.com/650b-27-5/650...ce-623853.html

    Shock mount offset bushings. Lowers the BB 1/4 inch, and reduces bottom travel tire clearance. There are other options if you search google. These were least expensive and are well made. The HD has 40mm and 22mm wide shock mounts, both with 8mm shock mount bolt holes. It took 3 weeks for the two I bought on eBay to arrive from Poland.
    Offset Shock Bushings Mounting Hardware Mount Kit All Frames Proshox | eBay

  14. #14
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    Quote Originally Posted by DH_WP View Post
    why would you opt for a HDR 130mm 650b when you can fit 650b on a HD 140 , and get a extra 10mm ... with the HDR you loose 10mm but gain tire clearance ...

    Why cant i have a 140mm HDR ?

    or am i missing the whole point?
    For compatibility with the existing frame, you have to get that extra 10mm of clearance by raising the bottom bracket height. some are willing to do that, but as ably explained by Hans of Ibis elsewhere in the Ibis forum here, for compatibility with the widest range of tire sizes and manufacturers of 650b tires, they put their reputation on the configuration that they can support and warranty. You can still do the 650b conversion on the HDR 160mm bike and get 145-150mm if travel, with a higher BB height.

    Personally, coming from an SL-R, I don't need more than 130-140 anyway, and moving to an HDR 650b is a no-brainer except for the existence of the Ripley. :|
    2013 Ibis Ripley
    2012 Ibis Mojo SL-R
    2009 C'dale Rize 3

  15. #15
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    Quote Originally Posted by DH_WP View Post
    why would you opt for a HDR 130mm 650b when you can fit 650b on a HD 140 , and get a extra 10mm ... with the HDR you loose 10mm but gain tire clearance ...

    Why cant i have a 140mm HDR ?

    or am i missing the whole point?
    Somewhere recently Hans mentioned that the HD 140 was actually closer to 130, so there isn't really a difference.

  16. #16
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    Quote Originally Posted by DH_WP View Post
    why would you opt for a HDR 130mm 650b when you can fit 650b on a HD 140 , and get a extra 10mm ... with the HDR you loose 10mm but gain tire clearance ...

    Why cant i have a 140mm HDR ?

    or am i missing the whole point?
    Hans just said the HD 140 is not really 140 but closer to 130. Only Ibis knows what the real difference in the wheel travel is but since they use the same shock lengths, I doubt it is more than a few mm.

  17. #17
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    Quote Originally Posted by DH_WP View Post
    why would you opt for a HDR 130mm 650b when you can fit 650b on a HD 140 , and get a extra 10mm ... with the HDR you loose 10mm but gain tire clearance ...

    Why cant i have a 140mm HDR ?

    or am i missing the whole point?
    Lower BB
    Larger tire clearance
    revised link
    Better 10/11 speed compatibility clearance on small cog
    Lighter frame, stronger supposedly
    Better shock compatibility with piggy backs
    ISCG compatibility with any guide type
    CCDBa option from factory
    New bonking colours
    26" compatibility

    Lots it seems

    Surprised there is not an XFusion option!

  18. #18
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    Quote Originally Posted by Maverick005 View Post

    Surprised there is not an XFusion option!
    I wrote to Ibis asking about the X Fusion option and this is what I got back from Scot:

    "We could do either the Cane Creek Double Barrel Air or the Fox Float CTD, but we can't sell the X-Fusion with the HDR"
    Scot
    You gotta Get Up to Get Down!

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