Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

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8 votes
3 answers
1k views

Were older bikes generally longer?

Tl;dr: Were bicycle frames in the mid-20th century generally longer than today? This post asked about the length of a Soviet bike from the 1980s. The frame is longer than that of a contemporary bike ...
29 votes
3 answers
7k views

Why Did Old Soviet City Bikes Have Longer Frames in General

Yesterday I got my hands on an old soviet city bike "Ukraine". It was produced in Kharkov velo factory, 1987. I could not help but notice that the bike frame has different geometry compared ...
2 votes
2 answers
94 views

Montague FIT folding bike with “snaking” frame

My 2012 Montague FIT folding bike has started to “snake” especially when riding at speed downhill. I have tightened the frame quick release and inspected and tightened the pivot nut but the snaking ...
6 votes
4 answers
1k views

What does it feel like to ride a mtb that has a bent frame

What are the signs and symptoms of a bent mtb frame? Or bent forks? What does it feel like when riding it?
5 votes
1 answer
90 views

Frame creaking even without BB and cranks

my 2011 Aluminum Specialized Stumpjumper HT Comp creaks a lot when pedaling, especially from a standing position. I tried changing the BB, greasing the cranks etc. but nothing helped. When I removed ...
6 votes
2 answers
298 views

Are rattling cables unavoidable with internal routing?

Someone shows you a bike with internal routing, and you marvel at all the advantages: you're not upsetting the tension by lifting the bike from its top or down tubes, there are no exposed sections of ...
4 votes
4 answers
1k views

Carbon damage assessment

Is it safe to ride? Will jb weld fill do the trick? Seems like this damage was caused by a to wide tire rubbing the frame. I don’t see any fibers exposed to be honest(but I might not know what I’m ...
2 votes
1 answer
929 views

What kind of bicycle do I have? manufacturer/model..frame?

I'm trying to figure out what kind of bicycle I have. I'm pretty new to this. When I started taking a closer look at my bike I realized that there are two different stickers on the frame. One says ...
2 votes
2 answers
116 views

Welding a centre kickstand plate to 4130 steel frame?

Hopefully a simple question (?!). I'm wondering if you could help me with a simple answer. I have a 30 year old UNIVEGA tandem frame that my family and I love to ride. The problem is, with a baby-seat ...
0 votes
1 answer
116 views

Which bicycle brand has the best (frame + fork) warranty?

Which bicycle brand has the best (frame + fork) warranty ? I prefer the lifetime warranty (LFW). But a TRUE lifetime warranty (not for first owner only). (For example TREK and Specialized has an LFW ...
1 vote
1 answer
471 views

determining make model and year of a BMX frame

is there a specific website where I can simply enter the bicycle serial number to determine the make model and year primarily BMX frames
10 votes
6 answers
2k views

Is it safe to ride a frame with a hairline crack in the head tube lug?

I am considering buying an Alan Super Record aluminium frame, but there is a hairline crack in the lug on the bottom of the headtube. Is this a big problem, and would it be unsafe to ride it? Is there ...
4 votes
1 answer
129 views

Unknown Bike Frame

EDIT: Someone in an FB group identified the bike as "Road Athlete". Not sure if this is a brand or a model. Unfortunately, the person who id the bike doesn't have much info either. I was ...
1 vote
3 answers
109 views

Bianchi Bike - Help Identifying Model

I'm looking at buying a Bianchi bike, I was wondering if anyone can tell from this image the type of bike, model and year. The owner bought it 2nd hand so doesn't have much info. Any assistance would ...
16 votes
3 answers
3k views

Is it safe to ride an aluminium bike with a big top tube dent?

Someone tried to steal this bike - they damaged the top tube. The frame is designed with a wide flat top tube. Is this still safe to use?
9 votes
3 answers
3k views

Did my frame just break?

Bike: Raymon HardRay E-Nine 6.0 I just finished adjusting the gear shifting for my first time. As I went for a test drive the chain immediately slipped down. Then I saw this. First I thought the ...
2 votes
4 answers
524 views

Help with identifying this "Cinelli" bike frame

Found this being sold for cheap locally, and I was wondering what type of frame this is, or if it is even a legit cinelli frame: Tried googling it, but I can't find any leads. Thanks for the help! ...
25 votes
4 answers
3k views

Can road bumps excite frame eigen frequencies?

During my last bike holiday I have happened to ride downwhill on roads which had transversal stripes to mark the approaching of a turn. The stripes were made with road paint, and were slightly higher ...
2 votes
5 answers
445 views

Why aren't there more bicycles and accessories designed specifically for women?

Why are there not more bicycles and accessories designed to ergonomically meet the needs of the female body? I'm not talking dresses or skirts. A range of skeletal features differentiate the female ...
3 votes
2 answers
10k views

Calculate frame stack and reach

Is is possible to calculate stack and reach for framesize 63?
3 votes
1 answer
418 views

Can I put downhill fork on any 29" bike

My friend has an X-fact bike made for 29" wheels, so we were wondering if he could put a downhill fork on it or he would need to buy a new frame?
-1 votes
2 answers
89 views

can you tell me anything about this bike. frame/brakes, etc

my friend inherited this bike. curious what he has. thank you!
0 votes
1 answer
49 views

I bought a Diamondback bmx at a yardsale but the decals are gone. The serial # is ACY4J14097. What year and model is this? Its an all chrome frame [closed]

Diamondback bmx serial # ACY4J14097. All chrome frame. DB stamped into back frame gussets. What year and model is this? All decals have been removed.
0 votes
0 answers
39 views

Unknown bmx stamp

I was given this bike a few days ago, but I do not recognize the stamp and have had no luck searching for it on the internet. The bike has Haro bars, forks, and crank, but the frame is something else.....
19 votes
10 answers
31k views

Rear wheel slipping out under load

My commuting/cyclocross bike (a Surly Crosscheck) has a problem. If I tighten the quick release skewer to a normal level, sort of firm to close it, then if I step on the pedals hard at some point, ...
23 votes
5 answers
33k views

Should or can I (car) wax my frame?

Having spent the whole summer taking a bike apart, painting it and now in the process of building it again, I was thinking about waxing it. I want the finish to last as long as possible, after all, I'...
4 votes
3 answers
220 views

Surly Straggler fixed gear build

For now, I live in a city and I have a surly steamroller frame that is very convenient for commuting everyday life. I will soon live in a small village from about 15km my work and I need to ride on ...
3 votes
2 answers
443 views

Should I be worried about potential chip in carbon near dropouts?

I just bought this bike second hand and I noticed this after. The chip is about 1/8 of an inch wide and about 1/32 deep. Is this a cause for concern?
2 votes
2 answers
91 views

Help Identifying Bike Frame?

Trying to identify this bike frame so I can build it with compatible components, AND so I can calculate it's value. Any help massively appreciated.
5 votes
1 answer
81 views

Long term durability of surface coatings for frames and parts

I'm trying to determine the best coating or combination of coatings for bicycles that I'm refurbishing. Along with other elements of making these bikes weatherproof (full chaincases, fenders, water ...
3 votes
2 answers
372 views

What brand of frame has a star cutout behind the seat?

What bmx bike has a star cut-out just behind the seat? sealed bb.
2 votes
2 answers
324 views

What is the model of this bike?

I am looking for the model of this bike. I'm considering buying it, but the owner doesn't know what brand/model it is. The bottom tube seems to have lost the brand name, but on the front of the frame, ...
4 votes
1 answer
380 views

Void in carbon frame seat tube, is it dangerous?

While assembling a carbon bike, I found this void in its seat tube. It's about 1/2 inch X 1/4 inch in size and I'm guessing almost a third to half the depth of the tube wall. Since it's right next ...
3 votes
0 answers
101 views

I need help identifying this womens bike frame, please

It's nearly 70 years old. I've narrowed the potentials down to Sears, Schwinn or possibly J.C. Higgins. I did just order the wheels for this and it takes 26" schwinn apparently as opposed to ...
9 votes
5 answers
8k views

What's the strongest way to bond a cable stop to an aluminum frame?

I recently picked up another well loved GT road bike frame- it's in great shape aside from a missing downtube cable stop. The model is a ZR 4000 probably from 1999, it's 7005 heat treated aluminum. My ...
3 votes
1 answer
331 views

Is this old steel frame MTB too big based on standover clearance?

Background: I'm a road bike rider but I bought a cheap but well kept old chro-moly steel frame 26er mountain bike (80s or early 90s model Miyata). I am planning on converting this to an ebike with a ...
1 vote
0 answers
40 views

please help identify this bmx brand logo!

having trouble identifying this logo found on my Bmx frame- any ideas? Many thanks
0 votes
0 answers
61 views

Please help me find the make and model

Hello, so I believe I have narrowed the make down to either a Marin frame, or an Orange frame but I've been wrong before, so any information anyone can give me on either how to find out the make and ...
1 vote
2 answers
96 views

BLB Viper - Is this frame OK?

I want to start building a fixed speed bike and think about having the BLB Viper frame set. Is it a good frame to start with or would you recommend to get a different ONE, like a Leader frame or a ...
3 votes
2 answers
449 views

What type of bikes have a steel frame with 135mm rear dropouts spacing?

I'm looking for a bike frame made of steel with a 135mm rear dropouts spacing. The reason is that I might have to cold set at ~ 138mm for a project. It could be a road bike, a mountain bike, or a ...
1 vote
1 answer
75 views

Can someone help me find what my frame model is?

A little backstory: so I bought the bike before 2 mounts and on the frame it says that its Orange 224 evolution but I browsed true the internet and it doesn't seem to be it the frames don't mach so I ...
0 votes
0 answers
46 views

What model/year is this frame?

I recently got this frame second hand after mine was damaged in an attempted theft. Having a couple of issues refitting, I wonder if anyone can identify the model/year?
-2 votes
1 answer
61 views

I have a BMX frame and I'm trying to identify by the VIN number [duplicate]

The VIN number is h b l y j e e 0 0 5 9 and then it goes b l – 2552 and then another part of it in dark dark 020 trying to find out what frame this is
2 votes
2 answers
111 views

Is it feasible to jerryrig a motorbike saddlebag as a bike pannier?

There’s a used rear bike rack and a used motorbike saddle bag people are selling in my area. I already set up a time and date to pick both up before I realized that this bag was for motorbikes, but I ...
0 votes
1 answer
496 views

Cracked carbon frame near seat post

A thick crack has appeared on the rear side of my carbon frame near the seat post. The crack formed after adjusting the seat post to the maximum recommended height. How might this have happened? Is ...
4 votes
2 answers
712 views

How to restore broken rear disc brake mount in carbon frame?

Look at the image: Bike model is Rocky Mountain Vertex 990. The frame is broken in a way that it's impossible to install rear disc brake. Possibly there may be a frame deformation. Is it even ...
0 votes
2 answers
155 views

Is a shared bolt between the rear shock mounting and rear swing arm ok?

I'm buying this for my brother mainly for deep-snow riding. The rider weighs about 120 kg (265 lbs). 26" x 4" (102mm) tires in the pictures, but I will install 26" x 4.8" (122mm) ...
2 votes
2 answers
1k views

What are these parts of the frame called?

Intro I am drafting a question about a frame problem, but I'm struggling with terminology. It seems "appropriate for stack-exchange" to start by asking about the terminology first. Main ...
0 votes
1 answer
71 views

Can I put a I fox 40 on 2018 Commencal Supreme SX?

I recently bought a Commencal supreme SX, which came with a double crown fork. The bike was a really good deal and I had never had a dh bike. This was one of my only selections, so let me know if I ...
1 vote
2 answers
266 views

Most durable bicycle frame: Titanium?

My Kuota carbon frame of 10 years is trashed. It was ridden for 100 000km in the most abhorrent weather conditions and never cleaned. It makes cracking sounds when under torsional loads, the steering ...

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