Mixed standard fork and frame

Forums Mountain Bike Forum Mixed standard fork and frame

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This topic contains 5 replies, has 4 voices, and was last updated by  vapidoscar 5 days, 15 hours ago.

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  • #290027

    Need advice: building bike up from frame.

    Have found the frame and fork combination that I want but frame is boost and fork is not. I wouldn’t have thought this would be such a problem but I can find individual wheels that I like.

    I figure my options are: 1) keep looking for wheels or fork or 2) get non-boost wheels and use adapters for the rear. Option 2 is probably cheaper but I don’t know how well it works.

    Bonus questions: what are the narrowest tires/rims (internal) you would use? 2.4″/27mm

  • #290032

    The Problem Solvers Boostinator kit works well enough, but the axle spacers do drop out every time you remove the wheel. It’s fine if you’re not removing wheels all the time and would be the simplest/cheapest solution. Some hubs do have boost conversion kits available, but not many.

    What fork are you looking at? I’m guessing you’ve just found a good deal on a non-boost fork?

    You could build a custom wheelset, it can be an expensive way of doing things, however it becomes significantly cheaper if you’re happy to build them yourself.

    bonus answer: I wouldn’t go much lower than a 25mm internal width. For reference, I’m running DT swiss E512 rims right now – 25mm internal diameter, running 2.5″ Maxxis tires. Works well. They’re a strong rim for not that much cash.

  • #290055

    I’d suggest (since this is an initial build) that you try to find a boost fork, unless you found an incredible deal on your fork. Its likely paying the difference in price will save you a lot of headaches down the road if you need to replace wheels.  Keep in mind, decent non-boost wheels will only get tougher to find and there’s a decent chance you might end-up buying two forks over the long run.

    Full disclosure; I have a boost frame/non-boost fork and am constantly on the lookout for good deals on boost forks for if/when I want/need new wheels…

  • #290063

    All tires can reasonably use a wide variety of rim widths.

    2.2 tires  i15-30 rims (i=internal width)

    2.4 tires  i20-35 rims

    2.6 tires  i25-40 rims

    2.8 tires  i30-45 rims

    3.0 tires  i35-50 rims

    However the i30 rim is the universal rim as it works reasonably well with 2.2 to 2.8 tires.  In addition nearly every rim/wheel manufacturer makes i30 wheels.  If you stick with boost hubs you can find some amazing deals on wheelsets with i30 rims like the DT Swiss M1900 Spline 30 for less than $500.

    However, you won’t find many premade wheelsets with non-boost hubs.  Non-boost hubs are history.  Getting a non-boost wheelset would likely require a custom build.  The extra you pay for the custom wheelset would likely cover the extra you would pay for the boosted fork.  Check out ColoradoCyclist.com for custom wheelset prices.  If it was me, I would go with boost hubs all the way and get a boosted fork.

    In addition, I would want any new bike to have frame clearance for at least 2.6 tires.  (All modern boosted forks have clearance for 2.8 tires.)  I’ve been riding 2.6 and 2.8  tires for a while now and I wouldn’t want to ride anything narrower ever again.  If you’ve been following mountain bike trends, you know many new bikes now come with 2.6 tires or at least have frame clearance for 2.6 tires.  And usually, those 2.6 tires are mounted on i30 rims.  Even if you go with 2.4 tires, leave yourself the option to use wider tires.

    Ideally, at least from my point of view, all modern Mountainbikes would have frame and fork clearance for 2.8 tires and come with i30 rims.  That way, the bike could use any tire from 2.2 to 2.8.   To the best of my knowledge, only the new 2020 Trel Fuel EX comes this way.

    • #290102

      In hindsite, I think my chart above is more useful if done in reverse.

      i25 rims   2.0-2.6 tires

      i27 rims   2.1-2.7 tires

      i30 rims   2.2-2.8 tires

      i32 rims   2.3-2.9 tires

      i35 rims   2.4-3.0 tires

      Ultimately,  every rim width can reasonably use a wide range of tire widths.

  • #290601

    So the fork I was eyeing up sold out but is still available in 29″ flavor. What are the thoughts running 27.5″ in a 29″ fork? The fork can be adjusted to 150mm instead of the 160mm that the bike is designed for, I think the angles should all be good still. Plus and mullet would be in play.

     

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