Seat Post w/>25mm offset, 30.9mm dia????

[Mtl_Biker]

Trying to get the ergonomics right for me on my new Explore E+1 GTS with small frame size. I'm way too cramped (by at least 4") in the cockpit. I found a longer stem of 110mm but since the stock stem was 60mm, it only gives me 50mm (just shy of 2 inches) longer reach. Not enough. So now I'm looking for a replacement seat post that has an offset of 25mm or even longer. Giant seems to have used a less popular diameter for their seat posts of 30.9mm There is nothing with an offset on the Giant web site (not the Canadian OR the US one) and one of the best sources in Canada is MEC (Mountain Equipment Coop). They don't seem to have anything that will fit. Oh, if the diameter was 31.6 or even 27.2 there would be several choices, just not for 30.9mm.

So, has anyone found an offset seat post in 30.9mm? I need an inch (25mm) offset at least, but a little more would be better.

I've checked local bike shop websites and called a couple and again this seems to be a less popular post diameter.

Any ideas?

 

[NeilJ]

Have you looked at Cane Creek Thudbuster SL suspension seat post has offset plus very good comfort.

 

[NeilJ]

Try this cheap option.

Bicycle Seatposts for sale | eBay

Buy Bicycle Seatposts and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many items

www.ebay.co.uk

 

[Deleted member 18083]

One of the best sources in Canada is MEC (Mountain Equipment Co-op). They don't seem to have anything that will fit.

Yes, they do: X_Fusion Manic 27.2–30.9mm shim.

Slip than into your Giant's seat post to convert its internal diameter to 27.2 mm and you'll be spoiled for choice in seat posts.
… David

 

[Mtl_Biker]

Have you looked at Cane Creek Thudbuster SL suspension seat post has offset plus very good comfort.

I wasn't really looking for a suspension seat post, but I don't see a "Thudbuster SL" on the Cane Creek website. I see an LT and ST. And I don't see any spec (that I understand) about how much offset the post can supply. My big issue is that I need to move the seat back about an inch (minimum) to two inches to give me more room in the cockpit.

Not to mention that on Amazon.ca the Cane Creek models would cost me over $200 (up to over $400) with shipping. I've never had a suspension seat post before and haven't really felt the need for one. But I was hoping to get a seat post for under $100 that would give me the offset I need.

 

[Mtl_Biker]

Try this cheap option.

Bicycle Seatposts for sale | eBay

Buy Bicycle Seatposts and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many items

www.ebay.co.uk

View attachment 36740

Interesting looking idea. I wonder how good it actually is.

 

[Mtl_Biker]

Yes, they do: X_Fusion Manic 27.2–30.9mm shim.
View attachment 36741
Slip than into your Giant's seat post to convert its internal diameter to 27.2 mm and you'll be spoiled for choice in seat posts.
… David

Thanks for that suggestion, but even with that shim MEC doesn't offer a seat post that'll fit 27.2 with an offset greater than 20mm. (I need a minimum of 25, and hopefully even more than that because 25mm would only give me an inch and I'd like two.) MEC has only two posts with greater than 20mm offset... one 25mm and the other 24, but they are both for 31.6mm diameter.

But I'll call around to bike shops to see if they have something in 27.2 with the offset I need. Thanks for pointing that shim out... it might very well be what I need.

 

[gorse]

Trade it in for the next size up - nothing worse than riding too small a frame. These Giant commuters fit very small, the reach figures are more suited to a road frame with drops and a massive old-school 110-120mm stem, than a commuter with a flat/low rise bar. Modern bike geometry trends support longer top tubes, shorter stems and wider bars for better control, whether climbing or descending.

 

[Deleted member 18083]

Thanks for that suggestion, but even with that shim MEC doesn't offer a seat post that'll fit 27.2 with an offset greater than 20mm.

Be adventurous: try somewhere else.

 

[Mtl_Biker]

Trade it in for the next size up - nothing worse than riding too small a frame. These Giant commuters fit very small, the reach figures are more suited to a road frame with drops and a massive old-school 110-120mm stem, than a commuter with a flat/low rise bar. Modern bike geometry trends support longer top tubes, shorter stems and wider bars for better control, whether climbing or descending.

No, the next size up is too tall for me... stand over height is uh, touching. The small frame is right but I just need to tweak the stem and seat post. I’ve got it very close to ideal for me now just by changing to a longer stem. Another inch would be good though.

 

[Mtl_Biker]

Be adventurous: try somewhere else.

Funny! As I said, I’ve called around to many bike shops already. Right now I’ve got the bike close to ideal with a 110mm stem and if I can’t find a seat post in this less common diameter to give me another inch, I might switch the stem to 150mm (which I’ve found locally).

 

[Bobsiii]

Try this cheap option.

View attachment 36740

Just ordered one, having similar probs getting set up just right on my Magnum Metro and wanted to try this before shelling out a couple of hundred bucks for Kinect, etc.

 

[Mtl_Biker]

Just ordered one, having similar probs getting set up just right on my Magnum Metro and wanted to try this before shelling out a couple of hundred bucks for Kinect, etc.

We’ll be waiting anxiously for your report once you’ve installed and tried it.

 

[DaveMatthews]

Yes, they do: X_Fusion Manic 27.2–30.9mm shim.
View attachment 36741
Slip than into your Giant's seat post to convert its internal diameter to 27.2 mm and you'll be spoiled for choice in seat posts.
… David

Beat me to it!

 

[DaveMatthews]

What size seatpost gives you the offset you want?

 

[Mtl_Biker]

What size seatpost gives you the offset you want?

I was at a big Giant dealer yesterday and we talked about seat posts and offsets... he pointed out that I’d missed the fact that the standard seat post already HAS an offset and that he didn’t know of any other posts that would work. I’d been under the impression that a post with 25mm offset (which I couldn’t find btw) would put my seat further back by an inch. But since the stock post already is offset by about (not sure where exactly to measure) maybe close to an inch, even if I could find one with 25mm I probably wouldn’t gain anything. The dealer told me that when fitting a bike for someone they don’t change the seat post but only the stem and sometimes the bars (rarely). He has stems in stock up to 150mm and the one I’d just installed is 110. I did a 70km ride with it yesterday and it’s almost perfect for me. My other bikes have a longer reach but this really wasn’t uncomfortable.

 

[DaveMatthews]

I was at a big Giant dealer yesterday and we talked about seat posts and offsets... he pointed out that I’d missed the fact that the standard seat post already HAS an offset and that he didn’t know of any other posts that would work. I’d been under the impression that a post with 25mm offset (which I couldn’t find btw) would put my seat further back by an inch. But since the stock post already is offset by about (not sure where exactly to measure) maybe close to an inch, even if I could find one with 25mm I probably wouldn’t gain anything. The dealer told me that when fitting a bike for someone they don’t change the seat post but only the stem and sometimes the bars (rarely). He has stems in stock up to 150mm and the one I’d just installed is 110. I did a 70km ride with it yesterday and it’s almost perfect for me. My other bikes have a longer reach but this really wasn’t uncomfortable.

Sounds like you're getting there!

 

[J.R.]

I was at a big Giant dealer yesterday and we talked about seat posts and offsets... he pointed out that I’d missed the fact that the standard seat post already HAS an offset and that he didn’t know of any other posts that would work. I’d been under the impression that a post with 25mm offset (which I couldn’t find btw) would put my seat further back by an inch. But since the stock post already is offset by about (not sure where exactly to measure) maybe close to an inch, even if I could find one with 25mm I probably wouldn’t gain anything. The dealer told me that when fitting a bike for someone they don’t change the seat post but only the stem and sometimes the bars (rarely). He has stems in stock up to 150mm and the one I’d just installed is 110. I did a 70km ride with it yesterday and it’s almost perfect for me. My other bikes have a longer reach but this really wasn’t uncomfortable.

I use a 110mm stem, it's about as long as I'm willing to ride. Longer stems change steering characteristics, slowing them down. Good and bad depending where you ride. For a road bike it can stabilize the bike at high speed. For a MTB, longer than 110 can put too much weight on the front wheel and slow the steering too much.

How does stem length affect a bike's steering and handling? - CyclingTips

Today’s marketplace provides a wide variety of stem lengths and angles, allowing riders enormous flexibility for fine-tuning their reach to the handlebars. While comfort and an effective position trumps all other considerations, Matt Wikstrom takes a closer look at the influence of stem length...

cyclingtips.com

There are tandem adjustable stoker stems available, that will fit on a standard bike. 155mm to 200mm. Obviously not designed for steering.

 

[gorse]

No, the next size up is too tall for me... stand over height is uh, touching. The small frame is right but I just need to tweak the stem and seat post. I’ve got it very close to ideal for me now just by changing to a longer stem. Another inch would be good though.

Standover is over-rated. How much time do you spend standing over the top tube compared to how much time you spend on the saddle? For me on my commute, it's zero. However, reach and top tube length are critical for good handling and proper pedalling fit. I also don't like having the front wheel tucked way back with a long stem; it feels like an OTB will be iminent should a sudden stop be required.

I guess if you can't touch the ground from the saddle you don't have too many options...

 

[Mtl_Biker]

I use a 110mm stem, it's about as long as I'm willing to ride. Longer stems change steering characteristics, slowing them down. Good and bad depending where you ride. For a road bike it can stabilize the bike at high speed. For a MTB, longer than 110 can put too much weight on the front wheel and slow the steering too much.

How does stem length affect a bike's steering and handling? - CyclingTips

Today’s marketplace provides a wide variety of stem lengths and angles, allowing riders enormous flexibility for fine-tuning their reach to the handlebars. While comfort and an effective position trumps all other considerations, Matt Wikstrom takes a closer look at the influence of stem length...

cyclingtips.com

There are tandem adjustable stoker stems available, that will fit on a standard bike. 155mm to 200mm. Obviously not designed for steering.

Thanks very much, J.R.

My first ride (67km) with the 110mm stem was quite comfortable and it may be all I need. But I was going pretty slowly, using ECO and even OFF mode because I was riding with my girlfriend who was complaining that I was going too fast.

In the morning I'll be doing my 32km commute to work with it and I'll be riding faster and probably in a different position. I'll know more after that commute.