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Questions tagged [frames]

Bicycle frame construction, selection, maintenance, and repair.

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8 votes
1 answer
2k views

Accidentally punctured through aluminum frame with a screw tip - still safe? Repairable?

I went to tighten up my rear rack and realized that it was actually a screw not a bolt holding one of the arms on my rear bike to my frame. Apparently I stupidly used a screw that's longer than the ...
Cmck's user avatar
  • 81
1 vote
2 answers
47 views

My rear dropout notch is 12 mm (roughly 1/2"), am I correct in thinking a 3000 watt rear hub motor axle won't fit?

The bike is a Seattle Micargi stretch The rear dropout width is roughly 180mm and the rear axle dropout notch was widened to 12-13 mm to accept a thru axle rim with a 12 mm axle. With the notch being ...
David's user avatar
  • 11
0 votes
0 answers
30 views

Trouble finding frame hanger Daymak to Shimano RD-R3000

Having a really tough time finding the following part: Frame hanger 3/4inch 1.9mm width screw holes. Frame # DMK17PR000000004 Derailer # RD-R3000 I've ordered a few, but there is always something ...
Darren Belanger's user avatar
9 votes
2 answers
5k views

What is the purpose of the top tube on bicycles?

What is the purpose of the top tube on bicycles? To neuter guys? My brother crunched his balls so hard on his bike, poor guy.
Gorka's user avatar
  • 149
3 votes
1 answer
314 views

Scratch or crack in alloy headtube?

I was going over my bike in preparation for the season, and noticed these marks on both sides of the bottom side of head tube, near the weld to the down tube. I can't find any other marks on the bike ...
Bob's user avatar
  • 31
3 votes
1 answer
219 views

Identify year of Kona

I have a Kona Process 134 DL. The serial number is H5AH31229 and I am trying to determine the year. There is also a sticker EN14766. And stamped 4, then under XL, then under T. Can anyone help? ...
Bob's user avatar
  • 31
0 votes
0 answers
36 views

Help identifying this Freeagent bike?

so I’m considering the purchase of this bike but all the information about it provided is that it is a Freeagent bike. There are asking $150 and depending on the model/year that may or may not be a ...
Jessop Scofield's user avatar
3 votes
2 answers
127 views

Help identify early 90s Chro-Moly MTB

I have this Chro-Moly bike I bought in the early 90s in Chile branded as Oxford, but I believe the frame is an import. One mechanic said it is japanese, another that it's italian. The rear part of ...
mantruc's user avatar
  • 31
0 votes
0 answers
24 views

2012 Cervelo R3 downtube cable stop - replacement part

I need two replacement downtube cable stops for a 2012 Cervelo R3. Does anyone know where I can get them? I found 1 for $50 which is outrageous. Any advice or leads is appreciated! Greg
Greg O's user avatar
  • 1
6 votes
3 answers
2k views

Is it correct that the bottom bracket shell thread does not go all the way around?

On the inside of the bottom bracket shell, the thread does not go all the way around. At the places where the tubes are welded (or attached) into the bottom bracket shell, there are holes in the ...
AhseemHermanson's user avatar
0 votes
0 answers
34 views

Question regarding serial number

Can anyone help me decipher this serial number on my DB? ACS6J02432 I am trying to figure out the exact year and model of this 24" BMX
Delirium Reality's user avatar
1 vote
1 answer
82 views

Heavy corrosion of the bottom bracket shell, but rest of the frame is fine

I have a Btwin MyBike cycle, which is now 8 years old. The frame is an steel alloy. I want to replace the bottom bracket, chrank shafts & chain ring. The BB was very difficult to remove, used a ...
Mellow Monk's user avatar
5 votes
1 answer
119 views

rear rack > frame compatibility (child seat)

I have a Topeak BabySeat II MTX 2.0 Rear Rack that is supposed to mount into threaded holes in the frame. However, my old road bike does not have these holes, and instead has eyelets welded to the ...
oldramrod's user avatar
1 vote
1 answer
292 views

Help me identify the model of this Cannondale frame

I tried everything, saw many catalogues and also tried with the serial numbers but still nothing. this is the serial code I think. From what I can read I see it's BNRB300131 and the other code is ...
Giovacar's user avatar
2 votes
1 answer
612 views

Reynolds double butted 531C top tube rusted, worth repair or not?

Pictures show underneath of top tube. Tube made of 25.4 mm (1 in) Reynolds 531C steel. Rusted through, cleaned a little with file, and most material is still there. Is it worth repairing? Carbon fibre ...
Fosgen's user avatar
  • 23
1 vote
1 answer
65 views

Another question regarding the specific size of stepped ferrules

I have a frame with in total 5 brazed-on cable stop with 5 mm inner diameter, on at the chain stay and 4 at the bottom bracket, and I'm using 4.5 mm outer diameter shifing cable housing. The standard ...
Peter Sanctus's user avatar
1 vote
0 answers
86 views

Can anyone tell me what frame this is please?

Can anyone tell me what frame I have here? It has RockShox forks and removable rear dropouts.
Bedshed420's user avatar
0 votes
0 answers
38 views

What Gary fisher model is this? [duplicate]

Repainted so pictures won’t help. Sn looks like T8T-1123 second row C44EMO15. 24 speed aluminum about 16.5 frame with Alivio derailleur. Original color was black with yellow trim. Thanks for any ...
Kip bollinger's user avatar
8 votes
2 answers
98 views

Carbon fiber frame and dropout alignment

I have tried searching for these and failed to find answers. Is there any tool available for facing a rear dropout to make the two parallel? The dropout alignment tools show that they are not aligned....
carhillclimb's user avatar
6 votes
1 answer
191 views

How does the frame geometry of a cyclocross bike affect its performance in off-road conditions?

The frame geometry of cyclocross bikes aims to offer a responsive and agile feel while providing stability and control over mixed surfaces. It allows riders to handle the demands of cyclocross racing, ...
Arunabh's user avatar
  • 123
3 votes
1 answer
77 views

Bent Marin team issue steel derailleur hanger. Can I salvage this incredible frame? What's next step?

I found a marin team issue on a local marketplace. The frame is in good shape it seems and I have many m900 parts from the time so I'd love to re-build completely. The main issue so far is the ...
tweedi's user avatar
  • 587
-2 votes
1 answer
150 views

Pinarello FP3 30HM12K real or not? [closed]

https://link.marktplaats.nl/m2032857289 Is this Pinarello FP3 real or fake? Serial number: 30HM12K Who explain to me. See the comments under please.
Willem's user avatar
  • 11
0 votes
1 answer
118 views

Can anyone identify this BMX frame?

Can anyone identify this BMX bike frame please?
Samuel's user avatar
  • 1
3 votes
1 answer
757 views

Wear marks on seat stay from fender/mudguard. Problem?

Mudguards have worn away where they contact the seat stay on carbon frame. A little deep, wondering if cosmetic or more serious. The one on the right stay doesn't look as deep but you can see 3 ...
olivercroke's user avatar
14 votes
2 answers
2k views

I need help identifying this "Mystery Bike" (could possibly be a real ferrari?)

New UPDATES below!!! Good day to everyone, So i have this really old bike. I don't know its brand and model. The paint is still stock, and it has a Ferrari sticker with the name "Michael ...
Anni's user avatar
  • 316
1 vote
1 answer
105 views

Carbon frame damaged? [duplicate]

I had a crash a couple of weeks ago with my BH Quartz. The front wheel got caught in a crack in the road, I heard a crack and I fell on the side. I was worried that the frame cracked, but couldn't ...
hagi10's user avatar
  • 11
3 votes
1 answer
537 views

On WSD bicycle shouldn't the seat tube be longer and at a shallower angle?

I bought a WSD ("Women specify design") bicycle for my wife which was delivered in a box. After putting it together I took it for a ride to test it and I realised two things. The seat tube ...
MindDBike's user avatar
  • 696
3 votes
3 answers
705 views

What is the name of bike fork spacer for shipping a bike frame?

I am trying to pack my bike for an plane ride, and while packing I wanted to know what is the name of the spacer that needs to replace the wheel(s) between the fork dropouts to prevent frame ...
Jas0n's user avatar
  • 87
2 votes
2 answers
367 views

Are these scratches in my aluminum frame structural or purely cosmetic?

My aluminum bike (Cannondale Adventure 1) was scratched on the welds connecting the seat tube and seat stays, and I was wondering if the damage is purely cosmetic, or if there is any structural damage....
Peachy's user avatar
  • 125
0 votes
1 answer
168 views

Is this a serious paint defect?

I am about to receive a bike and the shop has informed me of the following (cosmetic, they claim) paint defect: Since I don't have a lot of experience, is this something that might chip off? Or is ...
AJA's user avatar
  • 11
-3 votes
1 answer
92 views

Cassette Compatibility Issues [closed]

Because I sit at home playing games in doodle jump too much, I decided to buy a bicycle to exercise.
damagevirtuous's user avatar
2 votes
3 answers
262 views

Vintage 531 frame. Identify original make?

I rescued this bike from the tip a couple of years back and rebuilt it (in the UK). I am curious to know what the original make might be? The original frame had been badly repainted so no makers name ...
MiguelH's user avatar
  • 241
1 vote
1 answer
119 views

Another carbon damage assessment?

Mostly cosmetic? Chip is located on the bottom of the top tube. Did it go through a layer of carbon, or is that just paint/resin? Dime sized. This is an enduro mtb frame, so assuming it's built ...
levbec's user avatar
  • 11
1 vote
0 answers
187 views

What model is this Dyno? Serial number makes it 1995 Nitro? VFR?

All stamped Dyno, white chainwheel, forks, stem, and bars. Cant find another like it, wondering if parts may have been swapped out at some point because I cant find this colorway anywhere, the ...
P Gilbert's user avatar
1 vote
1 answer
59 views

Challenge Seiran luggage rack image or blueprint

Years ago, I bought a Challenge Seiran. At the time, I didn't bother buying the luggage rack attachment. Not the one attached behind the seat but the one going under it. For those who don't know, it ...
A.D.'s user avatar
  • 111
0 votes
2 answers
313 views

What size of inner tube fits a 650x47b tire?

What size of inner tube fits a 650x47b tire? It's gravel bike. The tire states it's tubeless ready but there's a tube in it currently.
Bobby magee's user avatar
-4 votes
1 answer
103 views

Is it possible to prove that applied forces to a top tube are worse than a seatpost when using a repair stand clamp?

This stems from the idea that you should use a bike stand clamp on a seatpost, if you can, for carbon fiber (CF) bike frames. Hopefully, this would avoid the cracking of a CF bike frame. In order to ...
cocobutters's user avatar
1 vote
0 answers
46 views

Need help identifying this logo on 2016 bmx

I was looking for a bit of help identifying this insignia on this 2016 bmx I'm restoring. Any help would be fantastic
Sellinyey FPV's user avatar
4 votes
1 answer
142 views

Which geometry specifications determine the seating position of an MTB?

MTB manufacturers release geometry data for their bikes. If I want to know if a bike has a more upright or stretched position, which geometry data do I have to compare?
JohnnyFromBF's user avatar
4 votes
1 answer
250 views

Aluminium frame alterations

I know it is possible to make almost any type of frame alteration to a steel frame. But what about aluminium? I would like to know if anyone has a first-hand experience in adding braze-ons, and doing ...
Art Gertner's user avatar
  • 2,837
0 votes
1 answer
180 views

Tiny dent near the bottom bracket of a new hardtail - should I be concerned?

I’ve just purchased a new Trek Roscoe 7 (aluminum hardtail mountain bike) recently and I’ve noticed this tiny little dent today. It is on the drive-side chainstay near the bottom bracket. Should I ...
TommyYOyoyo's user avatar
0 votes
1 answer
54 views

What do these specs mean? I have a Cannondale Road Bike 700x23c

I've been trying to find the model of my bike but I can't even find the year. 700x23c 175 EPE 45% PU 55% T 430 700 23-622
a_h's user avatar
  • 1
0 votes
0 answers
48 views

Help me decode Haro Vector serial number please

Recently acquired a Haro Vector mountain bike. Serial number V2K506004 anyone please help me decode this?
Josh Reedy's user avatar
6 votes
2 answers
1k views

Small dents on bicycle frame

Two weeks ago I bought Trek Checkpoint ALR5. Bike rides pretty well. It has aluminium frame. I bought it primarily for bike packing trips as it has ton of mounting points. After riding it for 2 weeks ...
Aivaras Poška's user avatar
4 votes
1 answer
84 views

Stainless steel ladies bike frame failure?

i am new to this group and this is my first post. My Japanese Miyata ladies bike had this problem for so long time. The down tube had come out for about 3mm from its connecter. It looks like there ...
Samitha Niduwara Bandara's user avatar
1 vote
1 answer
80 views

How to adapt a tube-mounted clamped accessory for a larger diameter tube?

I bought an Abus bike lock which came with a tube mount called the Abus EaZy KF. The issue is that this mount only supports up to 36 mm diameter tube but the smallest tube on my bicycle is 38 mm. I ...
Daniel's user avatar
  • 163
3 votes
2 answers
174 views

Carbon Damage on bridge, repair possible? If so, what steps are needed?

This is a follow up question to: Attachmentpoint rim brakes carbon bike, sratches/crack? So. My bridge on my x lite 4 seems to be delaminating. Unfortunately Rose does not want to honor their six year ...
roverhendrix's user avatar
17 votes
5 answers
3k views

Which frame material is the most sustainable?

I would like to buy a new road bike. However, I also want to make sure which material is the most sustainable. On the one hand in production and on the other hand in disposal. I had already asked a ...
Maik Lowrey's user avatar
3 votes
1 answer
250 views

Is the carbon frame disposal problematic

I heard from someone that carbon is difficult to dispose of. Does anyone know how to dispose of carbon frames?
Maik Lowrey's user avatar
-2 votes
1 answer
356 views

I don't understand why these bikes have the specific frame sizes

Why does huffy's Rock Creek mountain bike have the same size frame for the 26-in and the 24-in but the 29-in version has a huge frame like a 26-in mountain bike should not have the same size frame as ...
JØKËR's user avatar

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