Questions tagged [aluminum]

Questions related to bicycle frames made from aluminum alloy.

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6
votes
1answer
616 views

What does the frame material name of "SC7 Scandium" mean?

I just realised that my frame material is SC7 scandium. What does that term mean? Is it aluminium alloyed with other elements?
4
votes
3answers
199 views

Fork done for? Has slight cut on the steerer that

Got this cyclocross frame with a fork, didn't see the cut in the steerer tube until much later. Has a 1mm? deep cut on half of the steerer tube. Is this fork done for? Or am I just paranoid. Aluminum ...
4
votes
4answers
221 views

Reconciling the two aspects: carbon is stiffer for power, but offers a softer ride

At times composite (carbon) is touted as being stiffer than (aluminum) alloys as well as stiffer than steel (leaving Titanium to a different discussion). This means that the frame will not yield (much)...
4
votes
4answers
2k views

Drilling hole in aluminium frame

I want to attach a pump holder to my aluminium frame. Can I drill holes in it ? I would then use blind rivets with some glue for waterproofing to attach the holder. Is there a place on the frame where ...
3
votes
4answers
479 views

Can I cut the steerer tube with a pipe cutter?

I found out that Hozan lists a pipe cutter among its tools, and as far as I know all Hozan tools are made for bike mechanics. From one of the pictures it looks like this could be used to cut an ...
0
votes
1answer
77 views

Looking for a good mountain bike for my daugher. Want disc brakes and Fork lockout [closed]

My daughter is a teenager and we love going biking, either on trails or during camping trips. We are not hard core bikers, but she is ready for a bike upgrade as she is using a 20" wheel bike ...
-1
votes
1answer
94 views

Gravel bike frame material: carbon, aluminum, titaniul or steel? [closed]

For a long ride on a gravel bike, what is the best frame material?
4
votes
1answer
205 views

How can I tell whether any crank is cold forged, hot forged or cast aluminium?

I know that cold forging allows for sleeker designs because cold forged aluminium is stronger. Are there any other giveaways that indicate a certain manufacturing process?
1
vote
2answers
180 views

Aerobar, why would carbon cost more than aluminum?

I think carbon parts are generally more expensive to their aluminum counterparts. I'm perplexed because aluminum version is cheaper and weighs less too? What am I missing? Example: Profile design ...
0
votes
0answers
103 views

Carbon fork crack?

I have aluminum bike with carbon fork, this is in the front of the carbon fork, it is in both sides of it? It's a carbon crack or paint crack?
0
votes
2answers
63 views

Need help with gears and wheel alignment

i have an aluminium frame single speed. I wanted to know is it possible to add gears to it (correctly). I saw same model with gears installed but the rear wheel was not in line with front wheel and ...
2
votes
1answer
111 views

Aluminium "white rust" on roadbike. How bad is my situation?

After some research I did not find similar photos/examples to mine so decided to ask. Recently I have bought used aluminum road bike. I did check all other parts and they are in good condition, but ...
1
vote
1answer
122 views

Aluminum fork: paint defect or sign of strained?

I know there's a lot of question regarding paint defect or crack. But I need your opinion about this. Recently, I bought new bike but discounted and it's the last piece of it. On the back of the ...
11
votes
7answers
3k views

What are the most basic parts of a bicycle which cannot be upgraded over a period of time?

After reading this question: Cheap MTB with future upgrades v/s costly fully ready MTB, I myself had a question. What are the most fundamental parts of a bicycle? What are the things which we have to ...
1
vote
0answers
41 views

bike-frame-jig: customizations of a standard model - interesting features added [duplicate]

good day i am in the mid of creating a bike-frame-jig. the model is oriented at tanner w s jig: https://www.instructables.com/id/Bicycle-Frame-Building-Jig/ see some the parts (here as Acronyms ) he ...
1
vote
0answers
77 views

Trying to estimate cost of replacement for a stolen bike [closed]

The frame says "Nova" and "Columbus". I don't know the serial number. I believe the frame is aluminum. Purchased 2nd (or third) hand in California about 6 years ago. Above is a ...
6
votes
2answers
1k views

Can and should one install rivnuts into an aluminium frame?

I have an aluminium frame, and would like to add another bottle cage. But there are no mounts below the downtube. I've installed rivnuts into a steel frame before, which worked well. Can I install ...
1
vote
1answer
281 views

Aluminum (6061) frame dropout squeeze

I have a bicycle with a 6061 aluminum frame. I had to replace the rear wheel, and I bought a wheel with an axle length that is a few mm short for the dropout spacing. In order to fit the axle into the ...
18
votes
6answers
6k views

How is this damaged aluminium frame likely to fail?

I had an unplanned collision with a car yesterday (everyone is fine, thankfully) but my bike – a Giant Revolt 1 – now has a lovely new pair of dents. I cycled it home from the collision (~6km) and it ...
3
votes
2answers
599 views

Failure statistics of carbon fiber vs aluminum mountain bikes?

I've read a lot of carbon fiber vs aluminum debates. The anecdotal evidence for one being better than another is not very interesting to me. I'm interested in the statistics. Does anyone know where I ...
2
votes
1answer
59 views

Safe to use 10-speed wheel in a aluminum frame bike made for a 7-speed

I have a '91 Trek aluminum road bike which was originally equipped with a 7-speed drivetrain. I upgraded the drivetrain on another bike, so I transferred the old 10-speed drivetrain, to the Trek. The ...
1
vote
2answers
366 views

Bottle holder - aluminium or titanium bolts?

I'm a "weight-weenie" and optimize the bolts I'm using. Replacing steel with aluminium or titanium, depending of the location (to summarize: exerted forces, and dangerosity in case of breakage). ...
6
votes
1answer
167 views

Why have my crank arms started corroding?

I have a set of Rotor 3D cranks and I've just noticed that the non-drive-side crank arm is corroding at the end and around the pedal bore, beneath the surface finish. The drive-side arm is fine. I ...
3
votes
2answers
89 views

Deformed Headtube Around Bottom Cup

Crashed into a fallen tree at speed on my bike. I disassembled the front end to inspect for damage and noticed I could wiggle the bottom headset cup back and forth slightly. On further inspection, the ...
1
vote
4answers
636 views

badass-stuck seatpost [duplicate]

I've recently found a nice bike with a steel frame. Well I noticed the aluminium seatpost was stuck but had no idea how heavily. To be honest I never had a similar problem and underestimated that ...
1
vote
5answers
884 views

Carbon vs aluminium commuter for 50km per day [closed]

Is it worth it to purchase a carbon bike for commuting daily 50km. I'm thinking I would be faster and also be able to train on weekends for my first iron man this year. I don't have the funds to ...
2
votes
2answers
4k views

2014 vs 6061 vs 7075 aluminium components

I saw a crankset made of 2014-T6 aluminum alloy (so it was claimed). I read that this alloy is somewhere in between 6061 and 7075 in terms of strength. I also learned that it is also more brittle ...
1
vote
4answers
2k views

Aluminium Aerobars on Carbon Handelbars

Since I want to build up a new bike with road or gravel handelbars and aerobars I try to get as much information about it as possible. Now I have just watched a video where the person in it says (at ...
3
votes
2answers
791 views

Is this damaged aluminium frame unsafe to use?

Hello I have a Giant Seek 3 aluminium frame where somehow the rear rim has rubbed the frame creating a hole as shown in the picture. On the other side there has also been some rubbing/scratching but ...
2
votes
2answers
769 views

Help please - Dent in top tube of double butted aluminium frame

I have a ridgeback velocity which is labled as double butted aluminium. Around the middle of the toptube is a dent shown in the photo. There is also a short line above it which I can feel with my nail....
5
votes
1answer
703 views

Can I repair this valve stem hole?

Today I got a stick wedged between my frame and tubeless valve stem. In addition to snapping the stem I widened the hole a bit. Any suggestions on how to fix it? Current plan is to go over the whole ...
3
votes
0answers
232 views

Mavic Cosmic SLS - carbon separation

Some aero’ wheels are an aluminium rim with a carbon fibre shroud. On a Mavic Cosmic SLS rear wheel, I’ve found that the carbon fibre shroud is separating from the aluminium rim. Just visible in the ...
9
votes
1answer
261 views

Is this aluminium rim saveable?

I have an 8 inch rear wheel off an adult scooter. It appears to have suffered crush damage - at a guess someone's driven a car over the wheel while on its side. The bend is smooth and covers perhaps ...
3
votes
2answers
4k views

Suitable bicycle grease for aluminium and steel materials?

I hope you enjoy your day. A few days after of using my bike I have some troubling feeling about it. I can hear a cracking sound or something similar, and on the internet I found out the cause. I ...
2
votes
3answers
210 views

Is it cheaper to mass produce a carbon frame than an aluminium frame?

I've heard this comment but I have not found any information about it. Is it true?
3
votes
1answer
417 views

How to evaluate different alloy types used for bicycle frames?

Only certain alloys are used for bicycle frames besides other materials like carbon fibres (at least for the mass market). I often stumble over aluminium alloy 6061 and 7005 (and I think I saw 8004 ...
5
votes
1answer
3k views

How serious is the dent on alu frame?

I have crashed on my cyclocross bike and got a dent on it's alu frame. I don't see cracks. How serious is this dent? Can it lead frame to suddenly fail?
6
votes
4answers
5k views

Crack/fissure in the headtube

My 2007 Ghost AMR 5700 developed a crack or fissure at the upper end of the headtube. I do not know whether it developed over time or whether there was a specific event leading up to it; it looked ...
0
votes
1answer
852 views

How to remove alu seat post from carbon frame?

My aluminium seat post is seized into my carbon frame. To make matters worse the seat post is snapped at the seat post collar - nasty crash. Anyone have a way to get it out? Or is it time for the ...
3
votes
2answers
1k views

Is it safe to polish aluminum rims?

Everyone loves polished aluminum, but you typically have to pay a good 30% more for it vs. any other finish. Since polishing is a simple process requiring widely-available tools, I thought I could ...
0
votes
1answer
276 views

Is Trek Emonda ALR have thinner or thicker diameter tubing than the carbon model?

I'm wondering if Trek Emonda ALR have thinner or thicker diameter tubing than the carbon model SL/SLR? I might actually get the aluminum one if it's thinner.
4
votes
4answers
545 views

Aluminium rigid fork for winter

I'm looking for the bike for winter riding and found this one. It's all good, except for the fork: some people say that aluminum rigid forks can not absorb vibration and therefore are bad for the ...
2
votes
3answers
3k views

Harsh Winters bike - Steel vs aluminum frame?

I am looking to a buy a single speed commuter bike which I can also use through the harsh winters here. I have narrowed it down to two bikes - One has a 6061 Aluminium frame while the other has a hi-...
2
votes
2answers
3k views

Is it ok to sit on the top tube of my Cannondale CAAD12 (2017 model)?

I just picked up my new Cannondale CAAD12 bike the other day. During my first ride I occasionally was sitting on the top tube (waiting for traffic lights etc). After the ride was over I actually ...
3
votes
1answer
212 views

Can this frame be saved?

I had a little accident and went over the handlebars. I'm okay, I was able to ride the bike home, but it is obviously bent. Everything else on the bike seems to be fine, the wheels are true and ...
2
votes
4answers
757 views

Kickstands "designed for steel frame"

While looking for a rear kickstand, I came across one which says "designed for steel frames". Besides carbon frame which I am pretty sure cannot be "squeezed", is there a real difference among steel ...
7
votes
2answers
2k views

Aluminum frame quality - how much variation can there be and how to tell?

Take a look at these two aluminum frames. The first one is a $1k bike, and the second one is a $200 bike. Is there a significant quality difference between these frames? And if so, how can I appraise ...
4
votes
4answers
1k views

How do different frame materials affect the handling of a bike?

I can appreciate that some materials are lighter than others and some have more flex than others, but overall, how do different frame materials affect handling of the bike? Assuming the same geometry ...
1
vote
1answer
544 views

Restoring Aluminum Cranks

Is it all right to strip and then anodize (at a shop, I suppose?) aluminum cranks? I'm trying to build a bike and I saw second-hand cranks on eBay. They look like they're fine except for the ...
2
votes
2answers
22k views

Aluminum forks vs. carbon forks (with aluminum frames) what are the trade offs? [duplicate]

The all-aluminum frame bike will be cheaper. The aluminum fork should be more robust and less prone to breakage. The carbon fork will be more shock absorbing and comfortable. That's kind of how I ...