Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Framebuilding II - Enigma Ti travel bike
Comments
-
-
-
-
-
-
Advertisement
-
-
-
Once we had kids, the notion of flying on holiday pretty much went out the window. Holidays these days are stuff the car and roofbox, bikes on roof and rear rack and drive the hedgehog onto the ferry...
Yes indeed. Bikes and beach toys for 2.5 people:
Lumen, some of my team-mates are using bikes built with S&S couplers. With $150 charges per flight for over-sized luggage over here, it makes a whole lot of sense. The feedback I have heard is that they work very well. Personally, I would opt for components that make reassembly straight-forward (elegant or otherwise). Also, don't use cable crimps - solder the ends instead. Oh - another 1: always unbolt your rear derailleur, as those barrel adjusters love to break.0 -
-
-
Advertisement
-
-
-
I did a bike fit and build consultation today at Enigma's premises in the UK.
The premises are very "British industrial estate". Workshop downstairs, showroom/office upstairs. It was great to hear the chaps at work whilst we chatted over the build.
For bike fit they use the bikefitting.com system, although I didn't sit on the jig - they just measured height, inseam, shoulder width and arm length, then fed these into the software. It came out with a recommendation of 565mm top tube, which feels about right from my experience. Also validated my 40cm c-c handlebar preference.
Build decisions:
- Clearance and eyelets for full mudguard on the rear, but not on the front (probably going for Easton EA90 fork @ 350g). Apparently front clearance would require different frame geometry and would compromise my requirement for racy handling, whereas the rear only requires an additional 5mm of chainstay length, 415mm in total, 10mm more than my Addict. I don't really need a front mudguard anyway, and can always use a clip-on if it bothers me.
- Completely horizontal top tube. Apparently with round tubing (required for the S&S couplers) this will not look downward sloping like the tapered tubing on the off-the-shelf Esprit.
- Non-integrated headset (Chris King), for the classic look and also because the head tubes for integrated ones are made in Taiwan rather than in-house.
- A single 10mm headset spacer. Enigma normally build customs with 30mm of spacers, which surprised me, as I assumed that custom=no spacers, but apparently not - spacers keep the frame more compact, or something.
- Replaceable derailleur hanger.
- Bright polish finish with black decals.
There will not be much seatpost showing, but I'm planning on using my USE Alien Ti seatpost with a similar finish to the frame, so it should look quite neat and have a bit of give.
The CAD software is pretty cool.
0 -
-
-
-
-
I am actually studying plate theory at the moment, so I could answer this! But you asked for a mechanical engineer, so I'll leave it to them!
You're just a mech eng working at really large scales, surely?
Also psi??? Very American! We like real units this side of the Atlantic!
Gah, Euro fail - they came from whatever materials data sheet I was looking at. I think the answer is 3mm = not stiff enough, but I'll probably try it and suffer the consequences.0 -
-
-
Advertisement
-
-
-
niceonetom wrote: »Ok, so it seems Lumen is building something.
I'm gonna go with... windtunnel. Anyone else got any guesses?0 -
-
-
Recent posts moved from Broomwagon, since it's more on-topic for this thread.
I'm building a case for my travel bike. The one from S&S is very expensive to ship and I can't get it back here with helpers in time for my trip.
Also, it will be fun to make one my self.
So I need to make a case 26" x 26" x 10" (sorry, I'm copying an American product).
The candidate materials are:
- 4mm ABS plastic, which is probably what S&S use (estimated from product weight). Likely case weight: 6.5-7kg depending on fittings. Since I could buy a case like this I'd rather do something different.
- Aluminium composite panel (e.g. 3mm polyethylene core sandwiched between two 0.3mm aluminium skins). This is typically used for signage applications. Stiff and light but probably not very puncture proof.
- 3mm or 4mm clear polycarbonate. The 4mm or 4.5mm variety is what goes into riot shields. Incredibly tough but a bit flexy. I can even get acrylic piano hinges to create a completely transparent case which would be useful for luggage inspections.
- Aluminium honeycomb. Similar in principal to ACP, but thicker. Used (for example) in aerospace and motorsport. Probably very stiff and light, but quite thick which may make fabrication difficult.
Most of these are very cheap (around €100 or less) for the quantities I need.
I have two choices of finishing. I can either keep the box very plain and use a nylon box cover (already ordered with cardboard box as backup) or add a handle, corner protection, fasteners etc and do without the cover.
Top choices right now are polycarbonate (for toughness) or ACP (for stiffness). Or maybe some weird mix of the two.
I could even use polycarbonate but add ribs for extra stiffness.0 -
-
-
-
Advertisement
-
Advertisement