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Hi all,

Does anybody feels the bum going numb after a few hours riding the CB500F.
I rode almost 200 miles today. I was forced to take breaks for the sake of my bum. It keeps going numb.
 

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I made two modifications to the horrid OEM seat (typical of nearly all Japanese sport and standard bike seats) and spent $25 USD. The seat is too firm--way too firm--for my 135# frame. I felt as if I were sitting on a wooden plank. Also, the seats on nearly all Japanese bikes are inclined upward toward the rear of the bike--definitely the wrong inclination.

I removed the seat's cover and took a 1" hole hole cutter in an electric drill and drilled 12 holes equidistant in the seat, to a depth of about 1/2". This reduced the surface area actually pushing up on my sensitive butt. Then, I took an 8" x 10" x .5" motorcycle-specific gel pad, sourced on E-bay, and inletted this into the top of the seat. I had to do a bit of trimming of the pad as it was a bit larger than the seat toward the front of the seat. Once that was done, I replaced the cover with 3/8" T-50 staples. The seat is a lot better in terms of its firmness and I now howl in pain at less frequent intervals during my rides.

What is not better is the upward slant of the seat toward the rear of the bike. This causes the rider to be angled down in front and is traditionally uncomfortable. A comfortable seat in my opinion (and I've owned 85 bikes since 1953) should be parallel to the ground or even slant slightly downward toward the rear.

After a lot of looking, it appears that only Corbin makes a custom seat for the CB-500s and Corbins still slant up at the rear and are pitifully hard, tho Corbine will assure you that their "Comfort Foam" is supposed to be that way. Well, perhaps for some. It may be necessary to have a custom seat build using the OEM pan by Renazco etc. Any forum member with another source is encouraged to comment, with photos if possible.

Later this Fall, I will replace the shock absorber with one from Ohlins sprung to my weight. Not cheap,but I believe in "pay for the berst and only cry once". I will source a bit softer fork springs, possibly from Race Tech, and that will add up to a much better ride.

It is predictable in lower cost bikes that their suspensions often are the main economy from the makers. For some they may suffice, but for many riders aftermarket suspension is the most important upgrade.

Ralph
 

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I had the same issue with the factory seat and would usually stop every 45 minutes or so to stretch and allow my arse to regain feeling. Ultimately I bit the bullet and bought the Corbin seat. Not cheap by any means but in the end it was well worth it. I can now ride for hours at a time without needing a break.
 

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I had the same issue with the factory seat and would usually stop every 45 minutes or so to stretch and allow my arse to regain feeling. Ultimately I bit the bullet and bought the Corbin seat. Not cheap by any means but in the end it was well worth it. I can now ride for hours at a time without needing a break.
Can you enter a photo? That would be a big help.

Thanks...Ralph
 

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I had the same issue with the factory seat and would usually stop every 45 minutes or so to stretch and allow my arse to regain feeling. Ultimately I bit the bullet and bought the Corbin seat. Not cheap by any means but in the end it was well worth it. I can now ride for hours at a time without needing a break.
Can you enter a photo? That would be a big help.

Thanks...Ralph
See attached. I don’t have a good close-up of it on the bike so hopefully the one attached will give you a decent idea. It’s on the white bike in the photo. Black one belongs to Snade here on the forum.
 

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Thank you for the photos, JC. Another benefit of Corbin Seats is you don't have to send them your OEM seat pan. I did that with a custom seat builder about 7 years ago and they folded and disappeared (Rick Mayer Seats, Red Bluff, CA) and my deposit was gone too. Many got burned in that fiasco. I lost my money and the OEM GUzzi pan. Was really angry, to no avail. I'll buy a Corbin. It will be my 5th Corbin seat. I know what I'll be getting. No bad surprises.

Ralph
 

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The seats Honda has been supplying for their mid size bikes are more focussed on good looks rather than good ergonomics. I've had good luck making such a seat more comfortable by having 3/4 to 1" of foam removed from top of seat and replacing with similar thickness and appropriately shaped slightly less dense, (but not soft), foam, then reapplying seat cover. Can be done by yourself, but easily done for $100 or so (for a single seat) at an upholsterer. They also have the appropriate thickness and density foams at hand. I did it on a '12 CB1000F and may do same for my '13 CBR500R.
 

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The stock seat has never bothered me. When I tour I normally do 6-7 hour days with no numb-bum. My wife tells me I am brain dead, so perhaps that explains it. The only thing I do on long days is wear good quality well padded bicycling shorts as a first layer (no underwear). I do stop every couple of hours, but that is to stretch & shake off shoulder tightness & such; not a bottom end issue.
 

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The stock seat has never bothered me. When I tour I normally do 6-7 hour days with no numb-bum. My wife tells me I am brain dead, so perhaps that explains it. The only thing I do on long days is wear good quality well padded bicycling shorts as a first layer (no underwear). I do stop every couple of hours, but that is to stretch & shake off shoulder tightness & such; not a bottom end issue.
Maybe your wife is being a bit harsh.. You're not "Brain Dead"! I'm guessing "Bum Dead". :laugh:
 

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Bought the Corbin seat and love it.
Makes a big difference in comfort and lowered the seat height by a few mm.
My Corbin seat came yesterday and I rode on it for 65 miles this morning. Verdict as to shape is excellent. Firmness a bit too much, but that's typical for Corbin, who claim it will "break in" after about 1000 miles. The seat slants slightly down toward the front and I'd prefer it to be level or slanted slightly down toward the rear. I don't like to feel I'm being pushed forward by the seat. I've raised the bars 30mm and that helped a lot.

Overall, the seat is very sturdy, well made, worth its cost. I'm sure the seat would feel even better were the shock absorber beneath it more plush. Even with least spring preload, my light weight makes the shock overly firm. As it is, every bump in the road transmits directly to the rider through the seat. An Ohlins shock, sprung to my weight, will be fitted later in the year.

Ralph
 

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Hi all,

Does anybody feels the bum going numb after a few hours riding the CB500F.
I rode almost 200 miles today. I was forced to take breaks for the sake of my bum. It keeps going numb.
Yeah, the seat is terrible. Like sitting on a wooden bench. Disappointing AF. Not spending a bunch of money to put a seat on it. Looking at some sort of gel pad or memory foam.
 

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I said on the 2019 thread that I had bought a [slightly too big] Tourtecs air cushion. Yesterday I tested it.

In a roughly eight-hour 320-mile ride on all kinds of roads I probably spent about 20 minutes off the bike, though half an hour was spent sat stationary on the bike talking to someone at a petrol station. After that I had another 30 mile trip.

I am certain that I would be in agony after a journey of that length. Even had it been a normal day out, one with a several-hour gap in the middle. But I was not.

It is not that I did not feel anything, just that the discomfort was so minor that now I cannot remember it. Which is not something I would normally say. The pain from long rides will normally last the rest of the night and the memory hold for several days.

More experience with it is needed before I can say it has solved my problems, but my initial reaction is quite positive. (And with new tyres and okay weather the last 80 miles on rural B-roads (minor roads) was a super enjoyable ride.)
 

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Corbin Seat Quality

See attached. I don’t have a good close-up of it on the bike so hopefully the one attached will give you a decent idea. It’s on the white bike in the photo. Black one belongs to Snade here on the forum.
JCarrithers, I’ve read other descriptions of the Corbin seat made for the Honda CB500F, and the riders stated that the Corbin replacement seat also tilts forward, causing sliding into the gas tank just like the stock Honda seat. Have you also experienced this forward sloping Corbin? Do you know of any other replacement seats that provide a more level seating position?
PCG
 

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JCarrithers, I’ve read other descriptions of the Corbin seat made for the Honda CB500F, and the riders stated that the Corbin replacement seat also tilts forward, causing sliding into the gas tank just like the stock Honda seat. Have you also experienced this forward sloping Corbin? Do you know of any other replacement seats that provide a more level seating position?
PCG



Yes same here, the stock seat is crap.


Plasma1.
 

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JCarrithers, I’ve read other descriptions of the Corbin seat made for the Honda CB500F, and the riders stated that the Corbin replacement seat also tilts forward, causing sliding into the gas tank just like the stock Honda seat. Have you also experienced this forward sloping Corbin? Do you know of any other replacement seats that provide a more level seating position?
PCG



Yes same here, the stock seat is crap.


Plasma1.

Mine has a slight rise to the front. I don’t have any issues sliding forward with it and I dropped the triple tree down on the forks and the back is lifted slightly. I attached a pic for you to see. It holds me in place quit well, much better than the stock plank.
 

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Mine has a slight rise to the front. I don’t have any issues sliding forward with it and I dropped the triple tree down on the forks and the back is lifted slightly. I attached a pic for you to see. It holds me in place quit well, much better than the stock plank.



That looks great, how ever ,it will not fit on the post 2016 models.


Plasma1
 

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My Corbin seat came yesterday and I rode on it for 65 miles this morning. Verdict as to shape is excellent. Firmness a bit too much, but that's typical for Corbin, who claim it will "break in" after about 1000 miles. The seat slants slightly down toward the front and I'd prefer it to be level or slanted slightly down toward the rear. I don't like to feel I'm being pushed forward by the seat. I've raised the bars 30mm and that helped a lot.

Overall, the seat is very sturdy, well made, worth its cost. I'm sure the seat would feel even better were the shock absorber beneath it more plush. Even with least spring preload, my light weight makes the shock overly firm. As it is, every bump in the road transmits directly to the rider through the seat. An Ohlins shock, sprung to my weight, will be fitted later in the year.

Ralph
Thanks for reporting your experience with the Corbin seat. I'm OK with my stock seat, I'll never drive more than 20 miles or more than 1 hr on my CB500F, this bike is not intended for driving very long distances, I'd get the gold wing or similar bike for long trips. Driving long distances or long periods of time even in the more comfortable car one gets lots of pain in the back or butt.
 

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I said on the 2019 thread that I had bought a [slightly too big] Tourtecs air cushion. Yesterday I tested it.

In a roughly eight-hour 320-mile ride on all kinds of roads I probably spent about 20 minutes off the bike, though half an hour was spent sat stationary on the bike talking to someone at a petrol station. After that I had another 30 mile trip.

I am certain that I would be in agony after a journey of that length. Even had it been a normal day out, one with a several-hour gap in the middle. But I was not.

It is not that I did not feel anything, just that the discomfort was so minor that now I cannot remember it. Which is not something I would normally say. The pain from long rides will normally last the rest of the night and the memory hold for several days.

More experience with it is needed before I can say it has solved my problems, but my initial reaction is quite positive. (And with new tyres and okay weather the last 80 miles on rural B-roads (minor roads) was a super enjoyable ride.)
8 hrs /320-mile ridding a motorcycle? That is totally extreme for me :surprise:
At that much ridding even seating on a bubble of air would cause pain on your butt no matter what bike you ride plus all the forces involved hitting your body.
A motorcycle is just a horse with an engine and wheels. Have you ridden a horse for an hour? That's the fun of a bike, that is rough, tough, jumpy, kicking, requires good skill to riding, not like a car that drives by itself.
 
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