Engineering bicycle part by part

[Komarov]

What's the weight?

For the padded from Carbon 3d - around 140g or slightly less.
Without padding - depends on size, lacquer and finish but in average around 90 grams.

[LewisK]

Thanks for sharing, this is brilliant:-)

[Daveke]

Looks good!

Whats the price?

[MrCurrieinahurry]

Price?

[Komarov]

Price?

Looks good!

Whats the price?

3d printed saddles will arrive to us only in the middle of the spring I guess. We currently locked the design with Carbon3D team and now waiting for printing. The price will be around 400$ because unfortunately those 3D printed parts dont grow on the trees at all.

Also the price for raw carbon saddles is 250$ including the shipment

[spartan]

ok what is your website link?

can you give us a bio on your company? not many bike related brands from Russia.

[Komarov]

ok what is your website link?

can you give us a bio on your company? not many bike related brands from Russia.

Sure, here is the web-site: https://bjorncycles.com/ and an insta account https://www.instagram.com/bjorncycles/

Me and my partner who manage all Bjorn media and other stuff except engineering started to experimenting with cycling stuff around 3-4 years ago when I was still studying in my 6th grade how to develop satellites and ballistic missiles)) Fortunately I chose more peaceful way of applying my skills Already had experience working with composites from aircraft modeling - I was making RC gliders for myself as a hobby. So I joined the cycling hobby and aircraft modeling hobby and after couple of years of experimenting with different technologies and buying the machinery it looks like I managed to create what you can even call a range of products.

Guess I first thought about it because I had terribly uncomfortable saddle on my DH bike, like literally pain in the ass. I can say that it would be couple of years faster and many thousands $ cheaper to just buy myself a proper saddle, but it seems like I'm the sharpest tool in a shed here)

Anyway it seems like many more new products are to come, so its gonna be an interesting jorney if I dont kill myself with a slitting saw preparing the stocks for cnc-mill

[Komarov]

Hi everybody!

Thats been almost a month and I have some updates on how things are going. Nothing groundbraking but now when I look back - it seems like a lot of work

1) I've finished the moulds and prepared everything for production of lightweight aerobar extensions. They have a bend of 49 degrees and max length of 420mm.

The quality on the photo is out of the mould without lacquer. Just 35bars of pressure during the moulding doing their job.

They came out around 160 grams for set with 1 clamping zone and 420mm length (its possible to add the 2nd on another end of extension and use them reversed for praying mantis aero position on TT bike). Looks promising comparing to Profile design 270 grams for a pair of shorter extensions.

I figured that no one uses the area of the bend and optimized the cross-section there to make it "more aero". Tests showed that 1 extension capable of sustaining 150kgf of load (300kgf for a pair). That seems almost like an overkill considering almost no load on them from the rider.

Also I'm almost furious about clamping systems of the extensions - most of them utilize the clamp with only 20mm clamping zone width which is madness because such a small clamp cuts the carbon parts under the significant load. So the part breaks because its cut by the edge of the clamp and could be much stiffer and lighter if the clamps were properly engineered.
Imagine inserting your seatpost 20mm down into the frame and see what happens - you will break the seattube or a seatpost, who would thought it could happen?!

2) We've designed pretty interesting concept of Garmin/Wahoo computer mount and almost finished designing the moulds. Hope to machine them and test the prototypes next month

We target the weight of 15 grams with all titanium bolts et.c. We analized the natural frequency of the model and it seems that the little thing has to be quite stiff despite the low weight.
Also we've already tested the clamp and the carbon loop opens pretty easily to be mounted around the bar.

3) Made more moulds for bottlecages, sneaked a little upgrades on the design - they look almost the same, but work better with Purist and Camelback bottles (not that they worked bad before, but perfection has no limit ). Also add fancy logo (even didn't forget to mirror it on the mould so it would transfer to the part the right way) which is moulded into the part.

4) Here is just the cut in half seatpost I've sacrificed (it had no dents or anything else, just for sake of distruction (Hail Satan) and QC )

Thats all, but hope to bring some interesting stuff about engineering composite stuff in the future

[jorisee01]

I like the computer mount a lot!

Verstuurd vanaf mijn SM-G960F met Tapatalk

[MrCurrieinahurry]

Does the mount put the comp central can't quite see

[Komarov]

Does the mount put the comp central can't quite see

Of course it does!

[MrCurrieinahurry]

Was sure it would btw mate

[MrCurrieinahurry]

No mount for light underneath?

[Komarov]

No mount for light underneath?

Ok, I get it, I had to post all the renders and full info bout the mounting)

yes, it will possible to mount Gopro/light under the computer

I will make a full "how to" post once the prototype made and tested

[MrCurrieinahurry]

Excellent