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.Quote:
Originally Posted by Lionel
Printable View
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.Quote:
Originally Posted by Lionel
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 ?Quote:
Originally Posted by Tyler Evans
Oh dear, what is the over/under on the 'Lionel's Firefly' thread - 15 pages?
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!Quote:
Originally Posted by Lionel
You can imagine what that looks like: not tapered. ¯\_(ツ)_/¯
We have a range available.Quote:
Originally Posted by Lionel
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:
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Lionel, Confirmed... This is a 200mm tapered head tube:
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Lionel, I assume you are concerned about aesthetics. Let me be the first to say it looks good (on a frame that big)!Quote:
Originally Posted by Tyler Evans
There are few threads that make me want a bike as badly as this one...
WE ARE HIRING! Click the link for details >> https://fireflybicycles.com/about/employment
Attachment 102420
^ That ad belongs in the size 15 shoe thread.
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)
Attachment 103239
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:
Attachment 103240
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!
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.
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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.
:: Classic Side Shots :: A Retrospective :: Part XXIII ::
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:: Classic Side Shots :: A Retrospective :: Part XXV ::
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cool stuff -Quote:
Originally Posted by Tyler Evans
// New 2018 Firefly Titanium Seat Collars //
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More info HERE
:: Classic Side Shots :: A Retrospective :: Part XXVI ::
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Born of scrap metal and elbow grease. BEHOLD THE TITANIUM STRAW ::
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Available :: HERE
:: Classic Side Shots :: A Retrospective :: Part XXVII ::
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Spotlight Build :: Ti-Carbon Road ISP // Ogle Edition
A special build for framebuilder, watchmaker, designer, machinist, and all around perfectionist Josh Ogle. Josh designed and/or manufactured many of the titanium parts on this bike that make it so refined. To us, this bike checks all the boxes on the list of what a modern custom bicycle should be, but upon further inspection, you will notice some next-level tech. Custom made titanium details litter the frame from the stem faceplate to the derailleur pulleys with so many easter eggs in the middle. It was a true honor to have a friend, collaborator and vendor also become a client. An amazing project to be a part of.
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So sick. So very sick.
That thing goes to 11, but the headset bearing top cap goes to 12.
Love the subdued gray tape on an essentially battleship-gray titanium and carbon fiber bicycle. Very sharp.
:: Classic Side Shots :: A Retrospective :: Part XXXI ::
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3D Printed Ti-6Al-4V Flatmount Dropouts.
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Tyler, I noticed that the inside of one of your 3D printed dropouts has a grid/screen/matrix. I would assume they would be hollow. What is the purpose of this grid?
Great question. They actually are completely hollow. That mesh on the end is just a thin screen that is used to hold the OD tolerance during printing so the finished piece fits up to the chainstay tube perfectly. We machine the mesh out before we put them into the bike. We had to sneak in a bunch of tricks to get these dropouts to be the way we wanted. These dropouts pushed the limits of the printing machines and we eventually had to have our engineer work directly with them for the final production tweaks to make them actually printable. It was a big learning experience, as was the production of the Mono-Yoke. 3D printing is an amazing process yielding incredible results.Quote:
Originally Posted by joosttx
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Tyler those dropouts are evidently set up to use replaceable hangers: do you have your own proprietary design or are you using something more widely available?Quote:
Originally Posted by Tyler Evans
disc brakes seem to be in fashion !
We designed and made our own proprietary hangers in two styles: the longstanding style we call Regular (used by SRAM and most Campy) and the Direct Mount standard (Shimano). The disc side centers via the tapered Syntace Thru-Axle System. The thru-axle screws directly to the hanger on the drive side mechanically fixing it to the wheel and frame. The hangers are secured to the dropout by a small bolt on the inside face that keeps the hanger on during installation and when there is no wheel on the bike. The hangers are also keyed into the dropout by surrounding the rounded corner giving them added vertical stiffness and strength. By designing our dropouts and hangers together we feel we have simplified the interface as well as created a lighter, stiffer, stronger and more unified system.Quote:
Originally Posted by Mark Kelly
Regular:
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Direct Mount:
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Titanium Road ISP // Campy SR EPS // Winter Camo
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// Titanium Commuter with the ebike option //
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:: Classic Side Shots :: A Retrospective :: Part XXXV ::
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