All Questions

2
votes
1answer
124 views

140mm rear rotor for bike packing

Currently my bike has cable actuated disc brakes, which I will upgrade to Ultegra 8070 callipers and RT-800 Ice Tech rotors. I use the bike for road, some gravel and bike packing. The current rotors ...
-2
votes
2answers
106 views

Can you tell me what this frame is and year please

I need to identify a bmx frame i have Its a twin top rail
2
votes
2answers
148 views

Lowest rideable gear ratio

What is the lowest rideable gear ratio (chainring/cassette) possible without feeling like having to balance/trackstand? I'm doing some virtual simulations right now and I'm just setting up IRL limits. ...
2
votes
2answers
361 views

Bent Peugeot Carbolite 103 Frame

I have a vintage Peugeot carbolite 103 frame which is really bent. The rear triangle is bent in the direction of the drive side to such an extent that the drive side crank arm is blocked by the frame ...
2
votes
1answer
86 views

Will replacing 26“ suspension fork with rigid 29”

I have an old Nashbar mountain bike with a suspension fork. I would like to replace the fork with a rigid one. The suspension fork weighs tons and is too squishy since I ride it mostly on trail paths. ...
3
votes
5answers
225 views

How to recognize a bad tire?

The most expensive "consumable" while operating a bicycle would probably be tires. Enthusiasts endlessly debate the relative merits of different sizes, profiles, tread patterns,inflation pressures ...
0
votes
1answer
36 views

2 speed (double) shimano road shifter on triple chainring crankset?

I would like to put a 2-speed Shimano road shifter on my bike. The bike is 3-speed front crankset. Could I put these two together?
2
votes
1answer
74 views

To what extent should I insulate an electric bike battery during winter?

For temperatures between 0 F and 32 F, to what extent, if at all, should I insulate electric bicycle batteries? I have read that they do not like temperature extremes. Should I wrap a battery in 1 ...
6
votes
2answers
86 views

Play in headset with no upper bearings on a tandem bicycle

I have a half recumbent tandem bicycle. The front fork headset (under the front cyclist) is loose: I can feel some play when I put the front brake on and try to move the bicycle front and back. I ...
10
votes
4answers
3k views

Should I avoid hard-packed crusher dust trails with my hybrid?

I ride a Trek FX 7.2, with 35mm Bontrager hard-case lite hybrid tires. I'm still fairly new and inexperienced with cycling, and I've driven exclusively on roads so far. I'm looking to start ...
2
votes
2answers
88 views

Bridgestone Albelt

For reasons that have nothing to do with bicycles I retired in the Philippines. I needed transportation and due to traffic density and poor infrastructure a bicycle made the most sense. It's a poor ...
0
votes
2answers
193 views

Please identify my Orbea

Bicycle helps in my exercise to lower cholesterol. Like the way it coast and how light it is.
7
votes
5answers
247 views

Is there a way to calculate the correct bicycle tire pressure?

I have 57-559 (57 mm width, 559 mm diameter) / 26"x2.125" tires. I weigh about 95 kg / 210 lbs. The tire's sidewall shows a single pressure value of 300 kPa / 43 psi. However, this calculator shows ...
3
votes
3answers
141 views

Fixing leg position while turning

I've recently landed on asphalt because I've met the ground with the left pedal when turning left... It was painful, but no visible damage to me or bike... The problem is, that my natural position ...
2
votes
0answers
95 views

Can anyone give me some information on this Peugeot frame I bought this weekend?

I've been looking through old Peugeot brochures and searched the numbers on the frame but I cant find any pictures of any Peugeot bikes that look like this one. The chrome section with the flags of ...
7
votes
2answers
821 views

What could have caused a rear derailleur to end up in the back wheel suddenly?

This is a similar question to What exactly happened to my rear derailleur? but with some significant differences. My bike had recently been serviced (about 3 weeks/500 km previously). All that had ...
10
votes
5answers
3k views

Frame failure sudden death?

I had a serious accident, my fork suddenly snapped when riding. I sent my bike for repair (to get a new fork installed) and the guys at the shop hammered the frame in place, as apparently the frame ...
0
votes
1answer
201 views

Why would a frame lack serial numbers?

Other than being a custom frame or it was stolen is there a explanation for the frame to be missing the serial numbers? For instance do they use the same identification marks over seas?
1
vote
0answers
119 views

A carbon fracture or a paint crack?

I’ve spotted this crack on my carbon fork, only on the left side. The crack is exactly at the joint of aluminum dropout and carbon body of the fork. My bike is a 2010 Trek Madone Project One (OCLV ...
1
vote
2answers
64 views

How can I troubleshoot battery issues on an electric bike?

I've got an electric bike with a GWA Easi-A36 battery (10.8Ah, 33.8V). The bike has a GWA electric motor. When I turn the motor on (on the handlebar "computer"), the battery indicator tells me the ...
0
votes
1answer
46 views

Fitting a display to an ebike kit

I have an voilamart ebike kit, https://www.amazon.com/dp/B07Q7FJ8ZY/ref=sspa_dk_detail_3?psc=1 Is there an LCD display I can add to this kit, I've had my eye on this https://www.amazon.com/gp/product/...
2
votes
5answers
2k views

What can cause the front wheel to lock up when going over a small bump?

I was going over a bump. When the front wheel hit the bump, it suddenly stopped moving, the rear wheel lifted off the ground, and I was thrown face-first onto the road. I sustained injuries to the ...
3
votes
1answer
127 views

Help identifying make of steel elevated chain stay mountain bike frame

Could anyone tell me what is the make or model of this bike there are no visible numbers or name except for this sticker of the maker of the seat tube. I appreciate all the help. you guys know your ...
0
votes
1answer
40 views

Does the nukeproof horizon mtb rim have a brake track?

Does the nukeproof horizon mtb rim have a brake track? Can I use rim brakes with it? https://www.chainreactioncycles.com/nukeproof-horizon-mtb-rim/rp-prod161912
1
vote
2answers
86 views

How to protect brake cable that runs beneath top tube while hanging bike on rack

My bike's brake cable runs underneath the top tube. This is a problem when I hang the bike on my rack as the bike compresses the cable against the rack. I came upon this question here: Bike rests on ...
2
votes
1answer
100 views

What Gates Carbon Drive parts should I upgrade?

A friend gave me his old Trek District 1 bike, which has a Gates Carbon belt drivetrain. The bike's about ten years old. The equipment an old-style (pre-centre-line) CDC drivechain a splined (single-...
1
vote
1answer
61 views

Can't tighten thru-axle

Long story short, my cone nut came off while riding. Can I put it back without dismantling my freehub? And why I can't tighten my axle anymore? Only way I can tighten axle is without wheel. As soon I ...
0
votes
1answer
49 views

Raising handlebars using a stem raiser on B'twin Triban 500

I've just got a second hand B'twin Triban 500. The seat goes easily high enough, but I've not used a road bike before and the handlebars are far too low for me, even with all the spacers in place. I ...
-3
votes
0answers
121 views

Why do wheels vibrate on light braking? Disc brakes

When I put very little pressure (just enough for the pads to touch) the wheel shakes all around. This is a pedal bicycle with disc brakes.
6
votes
1answer
218 views

What is the function of these 'bulges' on the frame?

A friend brought me an old frame that he found on the roadside on bulky waste day (is that a thing outside of Austria and Germany?). The rear wheel was gone, the front one bent beyond repair, but the ...
4
votes
3answers
117 views

How to create a bicycle that rolls backwards when you pedal forward?

This may seem like a crazy question, but I am currently trying to design a kinetic machine where pilots are facing away from the direction of motion, adding whimsy and curiosity. As someone who doesn’...
2
votes
2answers
94 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....
2
votes
3answers
122 views

Maximum weight of a pedal vehicle

I can't seem to find a straight (approximate) answer to this question. What is the maximum weight of a pedal vehicle (cargo bike, rickshaw etc) an average person can drive at a decent speed, say 15-...
12
votes
4answers
3k views

Bent spoke design wheels — feasible?

The restaurant I ate at had these wheels with decorative bent spokes. Understanding that this wheel is decorative and wouldn’t work, could any wheel with bent spokes work? For this question, I’d ...
1
vote
2answers
89 views

Is my rear shifter broken? Ultegra 6800 shifter, 11 speeds, 9 clicks, only 8 causing cable tension change

I was riding and noticed that I wasn't getting to the two or three smallest gears. Shifting along the eight or nine largest gears were fine though. I checked the limiters and the cable tension and ...
1
vote
2answers
140 views

Sun protection clothing

I would like to see if there is clothing that can provide sun protection while minimizing sweating and/or allow air flow. Would also like to do the same with my bike helmet without compromising ...
1
vote
0answers
171 views

Is cycling killing me? Excessive congestion [closed]

For lack of insight elsewhere I thought I'd turn to the this active Exchange to see if others have had similar experiences with their respiratory system while cycling. (note: I have already seen a ...
4
votes
1answer
205 views

My new bicycle skids laterally, especially in the wet; what can I do about it?

My new bicycle is a new regular road bicycle (not specialist) with puncture tough tyres. The bicycle is fine otherwise but a bit rough on all the crappy pedestrian path elements in Japan like kerbs. ...
0
votes
2answers
97 views

What is the the difference between the new MTB Altus, Alvio, Acera?

What is the difference between these derailleurs. I want to change my derailleur and don’t know which one is better.
2
votes
2answers
86 views

Not able to get crank bolt into bottom bracket spindle

I recently posted a question about changing my chainset, I was advised on this SRAM chainset which I could use which would fit my square tapered bottom bracket. I have attempted to fit the new ...
1
vote
1answer
58 views

Cheap Apollo forks: The fork suspension feels too soft

I have a cheap Apollo brand bike which has very soft suspension and sometimes leaks brown rust coloured fluid if compressed hard enough. both sides have a plastic cap which prys open (not unscrewed) ...
9
votes
3answers
1k views

How do I get a cleat that's stuck in a pedal, detached from the shoe, out?

While out riding on my XC bike today, I encountered an issue with my cleat: The connector between the cleat and the shoe - the part that you screw into - died, and I lost a screw. So I had the shoe ...
1
vote
3answers
187 views

Replacing multiple spokes (9/36): more like replacing spokes or rebuilding a wheel?

I've never built a wheel and while I'd like to learn one day I'm not going to learn on this one. On Saturday my rear wheel ate my derailleur (and bent the steel hanger in the process)*. No spokes ...
0
votes
2answers
129 views

What parts do I have to change if I want to change my derailleur to higher speed?

I want to change my derailleur from a Tourney TY-300 to an Altus M2000. What bike parts do I need to change? I want to change my derailleur because i mostly ride forest trails and I have heard the new ...
-4
votes
0answers
57 views

I have a frame and bottom bracket serial # starts with SG15 can anone tell me what brand bike this is [duplicate]

Trying to find out what kind of bike I have, the serial number starts with SG15
2
votes
1answer
68 views

Replacing Raleigh record ace forks circa 1978

I wrecked my bike 7 years ago, in a bad crash. I rode home in shock. I went through a lot. I replaced the tires, tubes, wheels and brakes. The forks are bent and at higher speeds there is some weird ...
23
votes
7answers
8k views

How can I offer a test ride while selling a bike?

I am selling a bike to someone I don't know from Craigslist. I expect that the prospective purchaser will want to test ride the bike before making the purchase. How can I prevent them from riding ...
0
votes
1answer
69 views

Help! front wheel brake doesn't brake (Shimano)

when I squeeze my front wheel hand brakes, the lever goes all the way to the grip on my handle very easily. It feels like there is no force to it. On top of that, the brake pads do not move at all ...
2
votes
0answers
63 views

How do I ask a good “ID My Bike” question? [migrated]

When asking an "ID My Bike" question what information about the bike should I include? Would a good "ID My Bike" question need all of the following or are there a few key things that would offer the ...
4
votes
2answers
160 views

Mini-van for bicycle

I realize this is on the edge of asking for a "product recommendation", and is also likely to be viewed as "off-topic" by some because it's not directly about bicycles, but I need to get a new motor ...

15 30 50 per page