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Thread: Firefly Bicycles

  1. #241
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    Default Re: Firefly Bicycles

    Quote Originally Posted by Lionel View Post
    Is there a picture of a tapered heatube around 20cm somewhere ? Interested to check this out.
    I will review our inventory tomorrow and see if I have one to show you. I will also check our recent builds to see if we used one and show you a pic of a built bike with one.

  2. #242
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    Default Re: Firefly Bicycles

    Quote Originally Posted by Tyler Evans View Post
    I will review our inventory tomorrow and see if I have one to show you. I will also check our recent builds to see if we used one and show you a pic of a built bike with one.
    Thanks. How do you actually go after doing these tapered HT. Do you have a range of HT lengthts or is this bike by bike ?
     

  3. #243
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    Default Re: Firefly Bicycles

    Oh dear, what is the over/under on the 'Lionel's Firefly' thread - 15 pages?
     

  4. #244
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    Default Re: Firefly Bicycles

    Quote Originally Posted by Lionel View Post
    Is there a picture of a tapered heatube around 20cm somewhere ? Interested to check this out.
    I do not have one in stock to show you. We haven't built a frame with a 200mm tapered head tube yet. Ironically I am welding a 200mm straight 44mm headtube right now though!

    You can imagine what that looks like: not tapered. \_(ツ)_/

    Quote Originally Posted by Lionel View Post
    Do you have a range of HT lengthts or is this bike by bike ?
    We have a range available.

    IS41 / IS47 Tapered head tube lengths are currently made in these lengths:

    95 mm
    100 mm
    105 mm
    110 mm
    115 mm
    120 mm
    125 mm
    130 mm
    135 mm
    140 mm
    145 mm
    150 mm
    155 mm
    160 mm
    165 mm
    170 mm
    175 mm
    180 mm
    185 mm
    190 mm
    200 mm
    210 mm
    220 mm
    230 mm

    IS41 / IS52 Tapered are currently made in these lengths:

    100 mm
    105 mm
    115 mm
    125 mm
    140 mm
    150 mm
    155 mm
    160 mm
    165 mm
    170 mm
    175 mm
    180 mm
    185 mm
    200 mm
    220 mm

    Here are some examples of fairly large IS47:




  5. #245
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    Default Re: Firefly Bicycles

    Lionel, Confirmed... This is a 200mm tapered head tube:




  6. #246
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    Default Re: Firefly Bicycles

    Quote Originally Posted by Tyler Evans View Post
    Lionel, Confirmed... This is a 200mm tapered head tube:
    Lionel, I assume you are concerned about aesthetics. Let me be the first to say it looks good (on a frame that big)!
    Andy Cohen

  7. #247
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    Default Re: Firefly Bicycles

    There are few threads that make me want a bike as badly as this one...
     

  8. #248
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  9. #249
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    Default Re: Firefly Bicycles

    ^ That ad belongs in the size 15 shoe thread.
     

  10. #250
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    Default Re: Firefly Bicycles

    Hi Tyler!

    I was thinking about the issues for creating a modern fork the 650B or 26" low trail gravel/enduro/rando bikes recently and was wondering if you could share some of your thoughts about it.

    The two most noteworthy ones I can recall from you guys are Jan Heine's and this one from a few years back now.

    The traditional route for these forks was to have a lot of rake to bring the trail numbers down, using either canitlever or centre pull brakes to get adequate clearance for the wider tyres. Jan even sells fork blades specific for this application, with significant taper a slender, small diameter end.

    You end up with something lookling like this (Jan's Rene Herse)

    41.jpg

    With disc brakes, though, this fork design and/or material choice obviously needs to change to take into account the different forces placed upon the fork under braking. and you end up with something that look's like Jan's Firefly:

    firefly_studio.jpg

    On the two bikes you have built I linked to above you've gone with straight bladed forks, one segmented, the other unicrown. Reading up, it seems like the consensus is that there isn't any noticeable difference between a curved of straight fork, particularly when you add in the volume of the tyres for this application. Is that only true for a bike with a fairly standard road bike rake, or does that follow through even in these cases? Was a curved bladed fork something you considered on either of these builds? Is there any practical difference in the performance of the segmented or the unicrown design or is that also an aesthetic consideration?

    The other issue is the material one. To account for the pressures that the disc brake puts on the fork you need to beef up the blades. I was wondering what blades you end up using on these forks and how you think the ride quality is effected, compared to say a more traditional low-trail fork?

    I guess the overall issue I'm interested in is the effects on the feel and handling of the bike that the shift to disc brakes on low trail bikes is having. While there is a lot to be gained by moving to hydraulic disc brakes compared to cable operated rim brakes, there does seem to be a trade-off in the requirement for a beefy (heavier and stiffer) fork. How do you feel about this compromise? I guess ultimately the best solution to this might be for someone to start building a low-trail carbon fork to achieve the necessary stiffness at a lower weight?

    Thanks!

  11. #251
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    Default Re: Firefly Bicycles

    I guess the best way to summarize it would be that the fork is stiffer but the tires are more plush.

    The disc fork is not only stiffer, but stronger and thus heavier... assuming that we are talking about all of them being made of steel. So your 650b gravel grinder with disc brakes will have a heavier fork than if you chose another braking option.

    Handling-wise you will notice an increase in braking confidence and consistency through various conditions. You will also notice less hand fatigue on long descents. Handling will feel the same assuming that the geometries of the bikes and forks are the same. The low pressures run in the larger volume (and in most cases tubeless) tires that are being run these days absorb most of the road vibration so the fork springyness is not as much of a factor in handling characteristics.

    Unicrown vs. Segmented is essentially an aesthetic consideration. In either case, there are not a lot of steel tubes available, so they all end up very similar.

    You are correct in that carbon is the best material for the job and we are looking forward to low trail carbon forks becoming readily available for this purpose. Unfortunately, they are not here yet.






  12. #252
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    Default Re: Firefly Bicycles

    Thanks for taking the time, Tyler, much appreciated. I should also add that I don't think I could be more impressed by the way you guys have built up your brand. It's one thing to be able to build it, it is another to sell it and every time I see anything you produce you are really selling it! Your classy bikes look right at home next to the Herse.

  13. #253
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    Default Re: Firefly Bicycles

    :: Classic Side Shots :: A Retrospective :: Part XXIII ::




























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