I'm currently shopping for my first road bike. I'll be test riding this 1990 Klein Quantum on Sunday and expect to buy it. Dura Ace hubs and a mix of Dura Ace and 600 components. Hand built here in Washington state, I think it's a very cool ride.

I'm 6' 4" but only have a 32" inseam. I'm targeting 60cm, but looking at anything between 59 and 63cm. The Klein is a 59cm. The seller is the original owner and also has a 32" inseam.Monkeywrangler wrote:What frame size are you looking for? How much $$ are you willing to spend? I'm asking because DH has been thinking of selling his CF Trek/Lemond with Campy on it.
unit wrote:You may not like this answer...
That bike was built 20 years ago for a rider that valued speed over comfort. A bike like this would rarely get my nod for a rider hoping to log a lot of miles with typical retirees. Do you ride 6 months only out of the year? If so that is 1500+ miles a year.
I also saw more than a few early 90s model aluminum frames crack. If you decide to buy it, be sure to have it checked by a pro first. While you are there, ask for an estimate on drive train overhaul and when he/she expects this will need one.
As an avid road bike racer, even I would consider those bikes to be very harsh riding.
OK so you are more like 3000 to 5000 miles yearly! That is fantastic. A comfortable bike that is well suited to your needs is even more important though.Sequimite wrote:I appreciate the input. Since I'm new to this there will be many things I learn through experience. The group I'm with rides all 12 months. We don't turn back when it rains, but few of us will start a ride if it is already raining. I'm getting tired of them pulling away from me while I'm spinning away in my top gear.
I know conventional wisdom favors almost anything else over an all aluminum frame for a road bike. However, these other alternatives are also meant for 150 lb riders. When I was a skinny kid in high school I bottomed out at 195. I expect that I probably won't be below 235 again. That's why, rightly or wrongly, I'm looking at stiffer frames. Does that rationale make sense to you?
Aluminum is very rigid however Ti is strong but it flexes like steel.raven wrote:I don't know a whole lot about Road Bikes, but I know a little something about frame designs and material used in frames. As far as aluminum frames cracking, it depends on few things. High stress areas and material used. The high stress area are going to be at the head tube/steering tube or where the top tube and down tube meet and welded into the head tube. The others would be at the seat stays and bottom bracket area. These are are high stress/fatigue areas due to torque when pedalling and cornering at high speeds when body weight shifts.
As for material ...in the 90s I believe the desired material to be used in most road bikes was 6061-T6 aluminum. Which is a very durable aluminum, but there was another aluminum that came out then as well and was a bit stronger ...7005 aluminum.
Things to look for on the Klein ... check the type of aluminum and check the high fatigue areas I mentioned above ...mostly the welds. If it has thick and clean welds chances are it will last quite a while for you.
Back to fatigue. The reason the majority of road bikes and Mtn Bikes are made of aluminum and titanium, is because it is so rigid ...there is very little flex in the frame. This can be a good thing and a bad thing. Good in the fact that less stress will equal speed and maintaining that speed without energy being exerted into different different areas of a frame and losing speed. Bad in that, because there is no flex it cause stress cracks in those fatigue areas eventually leading to have to buy a new frame every few years.
One of the frames to look into, is a frame that is made of Cr-Mo (Chromoly Tubing). A Cr-Mo frame has flex, but in a way that allows the high stress areas to have less fatigue, because depending on the frame design/angles the torque is maintained in the bottom bracket so speed is maintained. That's an option to look into, but I'm not real sure if they make a road bike with Cr-Mo these days. I will say this ...Cr-Mo has come a long way as is much stronger than aluminum and in some instances stronger than Titanium depending on the heat treatment used. Hope I haven't confused you to much :o and Hope this helps a bit. Take Very Good Care, Be Safe Always, and Good Luck
.
God Bless :)
-raven-
Klein is a good bike many people don't know this but Gary Klein is the reason oversized tubes.Sequimite wrote:Bought the bike. Rode it 28 miles Monday and 23 today. As was stated, the stiff frame brings you every nuance of the road surface. However, I feel fine and have a lot of energy left at the end of the ride, plus IMO it's gorgeous. Here's a better picture: