Looking at the link to the Scott build, you could lighten that up a fair bit. Also running a Berk saddle/post combo could keep the weight down. Do you have to run drop bars on the bike. The only reason I ask is that you could run a bullhorn set up with the shifter in the end of the right side for shifting and if you need 1 brake could have a vison lever in the other side at 35g.
So there is potential to do up a stupid light build. For hill climb bikes that do not have to follow any set rules, I honestly do not know why people run drop bars with heavy shifter/brake levers.
I have a lot of ideas for a killer hill climb bike but no funds to make one.
I do a lot of climbing where I live on the west coast and one a single speed builds I have used in the past a 32t upfront and a 16 on the back has allowed me to climb some big hills. If I was to gear it I would run individual cogs something like this. 15,17,19,21,23,25 and just have them spaced out on the wheels for a good chainline.
Maybe run Sram and tune the RD to around 110g easy, shifter are only 69g, KCNC brake is 68g front and i could go on.
dparker wrote:I participate in the Mt. Washington Auto Road Hill Climb each year - 7.6 miles at an average gradient of 12% (22% for the last 100 feet, which is mean). At 12%, a 1% drop in total weight (bike plus rider plus stuff) translates to a 1% increase in speed - in other words, gravity provides 100% of the resistance.
So, given that I'm already so skinny my wife would kill me if I lost any weight, and that this race is really my only one each year - I train for it exclusively through the spring and summer, and finally that I'm turning 50 with in a year, and want to treat myself to something really silly - I thought of putting together a crazy light bike just for this race. And I don't want to buy anything new for it - just very light used stuff, so it shouldn't cost too much.
So here's what I'm thinking: I buy a used super light frame (maybe a Scott CR1 Limited?) and then turn it into a minimalist single speed, with no derailleurs, no brakes, tubular tires on super light rims, and shortened handlebars.
What do you think? Could I get down to 8 or 9 pounds total? Is it hard to use a standard carbon frame as a single speed - should I replace the dropouts so they're more horizontal?
Hi dparker, sounds like fun. I am a little older than you, but much heavier, and there is a ride I like doing from Samford to Mt Glorious in Brisbane. It's about 6kms of climbing of which the last 2kms average 15% (the motorbikes like coming down this road). I have set my bike up just for this ride still using a standard crankset but with an 11-36T cassette and XTR RD. This gives me 39/36 if required and it always is towards the top.
So, what am I suggesting ... that you use a double or triple crankset (probably what you have already), with a single ??T sprocket (to give the equivalent of 34/34 gearing or lower 22(F)/24(R)) and a nexus or alfine chain tensioner (or simply use your current RD set to the single sprocket but I think it will be heavier). This will allow you to use the front chainrings as your gear change mechanism.
What do you think ...
I think it would climb amazingly well and I like the hand position which reminds me of climbing on my MTB with the bar ends.
The frame is 1080g and the forks are about 324g, wheels are 1282g, tires are 164g each, tubes are latex, cassette is 110g, Sram Force RD tuned with carbon cages and pulleys, skewers were Omni racer as well as seat clamp. Masterpiece 31.6 post with carbon cradle, Fizik Arione carbon. Syntace stem is about 94g and the basebar has upturn cut so about 224g. Chain was full length for my standard set up so I could remove some links for sure.
This is going to be my trainer bike for now but with different wheels and I will add a front brake for those times I need to ride a 12.5lbs bike to the store. The lock will weigh more.
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styrrell wrote:Not sure if this is Kosher, but i have an old set of sub 1200 gm wheels (actaul weight, no tires cassette, qr, just under 1200 gms by a few gm, tubular /shimano compatible) that I will let go cheap.
smtyrrell99 at yahoo.com
5 dollars, that's my final offer. If I'm not mistaking, a year or two ago, the Mt Washington hill climb was won by a weightweenie with a R3SL
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