Fixing a cracked carbon fiber seat base?

you probably be better off buying a kit like this
http://www.carbonology.com/shop_det.asp?pf_id=85&pd_id=15900&pc_id=3214&sec_id=2116

basically you need to stick carbon fibre matting on either side of the seat base and stick it down with resin. Now you can get into endless debates about epoxy vs polyester. Epoxy is probabaly better but harder to use.

But if you see the price of the kit a new base is 10 quid more… so is it really worth it?

Also you could do without the carbon fibre and use 2 layers of fiberglass to get it back together. This would be cheaper and could be easier. Maybe try talking to auto body repair people in your area or talk to anyone that works in composites. THats what i did for my tech project and i made a carbon fibre desk and the university near me gave me all the materials !

As for oven baking thats for very high strength resins and while it’d be nice to use you dont wnat to put precured CF with uncured CF in the same oven.

Nah, wasn’t me. I have been riding with modified classic saddles (drilled to fit KH handles) and am on my thrid one of those since I broke my CF base in half. Will be buying another CF base soon (before unicon denmark), although I’m not looking forward to snapping another one!

Pics???

Here’s a gallery of the 1st classic saddle I made with KH handle:
http://www.unicyclist.com/index.php?page=gallery&g2_itemId=324056
http://www.unicyclist.com/index.php?page=gallery&g2_itemId=324070

Is that what you wanted pics of?

not true. only certain types of carbon fiber construction require that (and its called an autoclave, not an oven :wink: )

id suggest running some very well mixed epoxy resin into the cracks. best use 2 or 3+hour set time stuff than can be bought from most DIY/hardware/hobby/radio controlled shops. You will probably find carbon fiber cloth there too, especially in shops that do radio controlled planes. patch the cracked area with the cloth and resin (while the first lot is still wet) if the cloth had fibers running in all directions then one or two layers will be fine. If the fibers all run in one direction then put several layers with the fibers running in several directions.

Once that is done you might even want to carefully and gently (not too hot) warm the area with a hair dryer or similar to make the epoxy resin go runny and run nicely into all the cracks. Dont expect the end product to be as strong as the original!